The Martello Tower Museum is an offshore island or islet accessible from the coast of Mauritius, offering some of the island's most pristine marine environments and wildlife experiences.

The waters around Mauritius contain numerous small islands and islets (îlots), protected within the country's exclusive economic zone. Many of these islands host significant seabird colonies, pristine coral reef systems, and — in some cases — introduced tortoise populations and native forest restoration projects. Access is typically by glass-bottom boat, catamaran, or speedboat from the mainland.

A restored British fortification from the 19th century, the Martello Tower Museum provides insights into Mauritius’ colonial history. It features artifacts and displays detailing the island's past.

Snorkelling around Mauritius' offshore islands is often superior to mainland reef sites, as the islands are further from runoff and development. Expect to see an abundance of reef fish, coral gardens, and the occasional blacktip reef shark or eagle ray. Turtle sightings are common around several island groups.

Day trips to most offshore islands run from hotel jetties and purpose-built boat terminals. BBQ lunches on the island are a standard feature of organised excursions. For the best experience, book a smaller operator with a limited group size — larger boats with 50+ passengers can feel crowded at popular island destinations.

Note: some islands have landing restrictions to protect wildlife — always confirm whether landing is permitted before booking an excursion.