Prison Island gets its name from the prison built to condemn Zanzibari citizens to the isolation of the island, looking out at the coast. Previously owned by an Arab to house his rebellious slaves, the prison was never used, and the island is now home to a tortoise sanctuary, prison ruins and hotel. Prison Island is 20 minutes away from Stone Town by boat and has spectacular coral reefs to enjoy while snorkelling. Giant tortoises shuffle through the trees, with the patience that old age brings you. Originally thought to be from the Comoros Islands and Seychelles, some of these tortoises are said to be over 100 years old. Stately and lumbering, the tortoises have even been known to take children on a ride.