Visit Prison Island, also known as Changuu Island, located about 30 minutes by boat from Stone Town. The island was once used as a prison for rebellious slaves and later as a quarantine station. Today, it’s a popular tourist spot known for its giant Aldabra tortoises, some of which are over 100 years old. You can learn about the island’s history, stroll along its beautiful beaches, and snorkel in the surrounding coral reefs teeming with marine life.