Mauritius is ringed by offshore islands, lagoons, and marine parks. This guide covers every worthwhile excursion — from the famous to the under-visited — with prices and logistics.
Mauritius is an island — but its geography is really a system of islands, lagoons, and barrier reefs. The main island is surrounded by a near-continuous coral reef that creates a series of calm, shallow lagoons between the reef and the shore. Several uninhabited coral and volcanic islands sit within or just beyond these lagoons, accessible by boat in minutes to hours. These excursions are not tourist extras — they are, for many visitors, the highlight of the trip.
The character of each island is distinct. Île aux Cerfs is a white-sand coral island in a sheltered east-coast lagoon, calm and family-suitable all year. Coin de Mire is a dramatic volcanic spike off the north coast, rewarding for snorkellers. Île aux Bénitiers is a quiet west-coast island set in an area where spinner dolphins feed. Flat Island and Gabriel Island suit those after a sailing-day-out experience with snorkelling stops. Blue Bay Marine Park is the island's finest underwater environment — technically a day trip within the main island, not to an offshore island, but the most significant marine excursion available.
Planning matters. Which island suits you depends on where you are staying (east-coast guests have easy access to Île aux Cerfs; north-coast guests are best placed for Coin de Mire), the time of year (trade winds affect north and east coast conditions from June to August), and whether children are involved. This guide covers each excursion with honest logistics and a cost table that shows what you will actually pay.
Île aux Cerfs is a 87-hectare coral island privately owned by the Touessrok group. It sits in the sheltered Trou d'Eau Douce lagoon and is reached by speedboat in 10–15 minutes from the jetty at Trou d'Eau Douce village. The island has no permanent residents and no road vehicles — only beach, palm forest, a championship golf course (one of two holes played across open water), and a cluster of restaurants and beach-sports operators.
The beach on the western side of the island is the main draw: calm, shallow turquoise water, fine white sand, and consistent shelter from trade winds thanks to the reef and lagoon geography. Children can wade safely; snorkelling off the western tip reveals reasonable coral and reef fish. Water sports available on-island include parasailing, jet-ski hire, pedal kayaks, and glass-bottom kayaks.
Food options range from casual beach bars to the island's sit-down seafood restaurant. A seafood BBQ lunch is the standard offering on organised day trips — grilled fish, prawns, calamari, with rice and salad. Bring cash or a card; the island is not free to access (you pay your boat and you pay for food and activities individually). There is no entry fee to the island itself.
The key decision is how to get there. Group catamaran excursions cost €45–€70 per person including lunch and are the budget option — but the catamarans carry 20–30 people, departure is fixed, and the experience is noticeably more crowded. A private speedboat hired for a half-day (through your hotel or a local operator) costs €70–€100 for the boat (not per person) — significantly better for couples or small groups, with flexible timing and a 10-minute crossing instead of 45 minutes. Most east-coast hotels with their own marina (Four Seasons Anahita, Constance Prince Maurice) operate private water taxis for guests.
Best for: All travellers — families, couples, groups. The most accessible and reliably enjoyable excursion on the island. Book a private boat if your group has 2–4 people; the per-person cost is comparable or cheaper than organised tours and the experience is materially better.
Coin de Mire is an uninhabited volcanic island 4km north of Cap Malheureux, visible from the north coast on clear days. It is protected as a nature reserve and landing is not permitted, but the surrounding reef — sheltered from the open Indian Ocean by the island's volcanic profile — is among the healthiest in Mauritius. Snorkelling here is genuinely good: high coral cover, strong fish diversity, and relatively few visitors compared to the east coast.
Most excursions run as full-day sailing trips combining Coin de Mire with Flat Island and Gabriel Island to the east. Operators depart from Grand Baie or Cap Malheureux, typically between 8am and 9am, returning by 5pm. A BBQ lunch is usually served on the catamaran or on a beach at Gabriel Island. The sailing component — 4–6 hours on the water — is part of the appeal; this is more a sailing day than a beach day.
The best conditions are April to October, when north-coast seas are calmer. June to August trade winds can make the crossing choppy; north-coast hotels will advise on conditions. Coin de Mire excursions are best for snorkellers, those who enjoy sailing, and travellers staying in Grand Baie, Cap Malheureux, or Balaclava who want an excursion that doesn't require a two-hour drive to the east coast.
Île aux Bénitiers sits in the west-coast lagoon near Le Morne, roughly 20–30 minutes by catamaran from La Preneuse or Tamarin. The island itself is small and quiet — calm water, a beach, and basic facilities. The excursion is primarily booked for the dolphin encounter: spinner dolphins feed and travel in these west-coast waters reliably year-round, and early-morning departures (6–7am) offer the highest probability of sightings.
Ethical operators observe dolphins from a distance without chasing or surrounding pods. Choose operators who follow the Mauritius Wildlife Foundation guidelines — dolphins are wild animals and the experience should be non-intrusive. After the dolphin excursion, boats typically anchor off Île aux Bénitiers for snorkelling and a seafood lunch. The west-coast lagoon is calmer than the east coast when trade winds blow (the prevailing south-east trades affect the east coast more than the west). Good all year, but particularly comfortable May to November.
Best for: Families with children (spinner dolphins are highly visible and active), couples wanting a quieter alternative to the crowded Île aux Cerfs experience. Less good for those primarily interested in beach quality — the west-coast beaches are narrower and less sheltered than the east.
Flat Island (officially Île Plate) and the adjacent Gabriel Island lie 15km north of Grand Baie, beyond the reef. Both are uninhabited; Gabriel in particular has an exceptional beach — white sand, clear turquoise water, and a fraction of the visitor numbers seen at Île aux Cerfs. The crossing is longer and more exposed than east-coast excursions, making this a full-day commitment rather than a half-day trip.
The appeal is the journey as much as the destination. The catamaran ride is open-ocean sailing, typically with a following wind on the outward leg and some swell — exhilarating rather than difficult, but not appropriate for those prone to seasickness. Snorkelling near Flat Island and Coin de Mire (often included on the same itinerary) offers some of the best underwater visibility in Mauritius. A BBQ lunch on Gabriel Beach — deserted except for the day-trippers on your boat — is the day's centrepiece.
Best for: Those who want a genuine sailing experience, snorkellers wanting pristine reef, and travellers staying on the north coast who want to avoid the drive to the east coast. Not ideal for young children who may find the crossing uncomfortable, or for anyone who primarily wants a calm beach day.
Planning to dive as well as snorkel? The Mauritius scuba diving guide covers the best dive sites near Coin de Mire, Blue Bay, and Flic en Flac.
Blue Bay Marine Park is the most significant marine protected area in Mauritius — a sheltered lagoon with documented high coral cover, fish diversity, and sea turtle presence. Unlike offshore island excursions, this is accessed directly from Blue Bay beach (a public beach) without a boat transfer to an island. Glass-bottom boat tours run from the beach; snorkellers and scuba divers can enter directly from the shore.
Coral quality here is verifiably above average: the protected status has reduced anchor damage and fishing pressure, and the result is visible underwater — dense coral formations in water clear enough for productive snorkelling in 2–5 metres depth. Sea turtles are commonly seen. The park is best visited in the morning before the afternoon sea breeze disrupts visibility. Avoid weekends and Mauritian public holidays when local visitor numbers are highest.
The hotel most directly positioned for Blue Bay access is Constance Le Chaland Iko Mauritius, which sits adjacent to the marine park boundary. Guests can snorkel from the resort beach directly into protected waters. This is genuinely one of the site's highest-value location advantages — no boat required for the island's best snorkelling.
Best for: Snorkellers, divers, families, anyone prioritising marine wildlife over beach or sailing. Also the right choice for travellers without much time who want to see the best underwater environment with minimum planning.
Rodrigues is not a day trip — it is a destination that happens to be within the same country. At 570km east of Mauritius, it requires a 1 hour 40 minute flight (Air Mauritius operates multiple daily services) and a minimum 2–3 night stay to justify the journey. The island has no large hotels, no resort infrastructure comparable to the main island, and a local character that is entirely distinct.
What Rodrigues offers is what Mauritius has lost in places: genuine remoteness, empty beaches, slow local life, and a lagoon that is — by some assessments — even larger and shallower than the main island's equivalent. The Rodrigues lagoon is extraordinary: at low tide it is possible to walk hundreds of metres on exposed sandbars and coral flats. Kitesurfers rate it among the Indian Ocean's best, and the diving and snorkelling are largely undiscovered.
For travellers spending 10 or more nights in Mauritius, spending 3 nights in Rodrigues is a genuine upgrade to the overall trip. For shorter visits, the logistics don't justify it. Accommodation is modest by luxury standards — guesthouses and small boutique lodges rather than five-star resorts.
| If you want… | Choose | Notes |
|---|---|---|
| The classic Mauritius beach day | Île aux Cerfs | Most accessible; private boat recommended |
| Best snorkelling & coral | Blue Bay Marine Park | No boat needed; enter from shore |
| Dolphin encounters | Île aux Bénitiers | Early morning departure; spinner dolphins |
| A full sailing day | Flat Island + Gabriel | North-coast departure; whole day on water |
| Best reef snorkelling near Grand Baie | Coin de Mire | Combined with Flat Island; full day |
| Quietest beach with fewest crowds | Gabriel Island | Included in Flat Island day trips |
| A genuinely different island experience | Rodrigues | Minimum 2–3 nights; flight required |
Most excursions depart 8–9am. Île aux Cerfs gets busy by 11am — book a private boat and arrive at 8:30am for the best conditions and empty beach time before group tours arrive.
South-east trade winds (June–August) make east-coast lagoons choppier and north-coast crossings rougher. Ask your hotel for daily sea-state advice before booking a same-day excursion.
Reflected UV off calm lagoon water is severe. Reef-safe sunscreen is standard on guided trips; bring your own and apply before boarding. A long-sleeve swim top is worth packing for a full day on the water.
Card readers are present at Île aux Cerfs restaurants and water sports operators, but connectivity can be unreliable. Bring MUR 1,000–2,000 cash for incidentals, tips, and any walk-up activities.
Hire snorkel sets on-island are adequate but often poorly fitting. A basic mask-and-snorkel from a dive shop in Port Louis costs €15–€25 and makes a material difference to the experience, particularly at Blue Bay.
Do not touch coral, chase turtles, or crowd dolphins. The best underwater experiences are observational — operators who encourage wildlife contact rather than observation-only are not worth booking.
| Excursion | Departure | Duration | Cost (private boat or per person) | Includes lunch? |
|---|---|---|---|---|
| Île aux Cerfs — private speedboat | Trou d'Eau Douce | Half-day (4hr) | €70–€100 per boat | No |
| Île aux Cerfs — group catamaran | Grand Baie / Trou d'Eau Douce | Full day | €50–€70 per person | Yes (BBQ) |
| Coin de Mire + Flat Island (full day) | Grand Baie / Cap Malheureux | Full day (8hr) | €60–€85 per person | Yes (BBQ) |
| Île aux Bénitiers + dolphins | La Preneuse / Tamarin | Half-day (5hr) | €55–€75 per person | Sometimes |
| Flat Island + Gabriel Island | Grand Baie | Full day (8hr) | €60–€80 per person | Yes (BBQ) |
| Blue Bay Marine Park — glass-bottom boat | Blue Bay beach | 1–2 hr | €15–€25 per person | No |
| Blue Bay — snorkelling from shore | Blue Bay beach | Self-paced | Free | No |
| Rodrigues Island — return flight | SSR International Airport | Min. 2 nights | €120–€200 per person (return) | No |
All costs are approximate 2026 estimates. Hotel-booked excursions may be priced higher; third-party operators at departure points typically offer lower rates. Always confirm the full inclusion list — some tours include snorkel gear, others charge extra.
Where you stay determines which excursions are practical without a long drive. These three hotels offer the best positioning for the island's most significant day trips.
The highest-rated resort on the site and the best base for Île aux Cerfs excursions. Four Seasons Anahita sits on the east-coast lagoon in Beau Champ — a short private water taxi from Île aux Cerfs. The resort has its own marina and runs guest transfers to the island on request. The lagoon estate also contains the Ernie Els-designed golf course, and overwater villa guests can snorkel directly from their deck into the resort's protected bay. A genuinely premium base for any east-coast excursion.
Rather than taking a day trip to Île aux Cerfs, stay on it. Bubble Lodge is a small collection of transparent spherical suites positioned in the forest interior of the island, combining the novelty of see-through sleeping with immediate beach access. Guests experience Île aux Cerfs without the day-tripper crowds — evenings and early mornings on the island after the boats have returned to the mainland are genuinely private. A highly distinctive option for couples or small groups wanting a one-night base on the island itself.
The only resort positioned directly adjacent to Blue Bay Marine Park — guests can snorkel from the beach into the protected zone without a boat or transfer. Le Chaland is a strong five-star property in its own right (8.8/10, second highest on the value rankings) with a private beach, full spa, multiple pools, and consistently strong guest ratings. For travellers who rate underwater experience above everything else, this location is unmatched on the island. The drive to Île aux Cerfs takes around 30 minutes; the south coast's other beaches are within 15 minutes.
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