Prison Island also known as the Changuu Island lies jusy off the Old Stone Town about 30 minutes by boat from stone town. Changuu Island was used as a penitentiary for rebel slaves by the sultans from the 1860s until the end of the slave trade. After which the British began building a prison on the island under the guidance of First Governor, Lloyd Matthews. This was completed in 1894. However, the ‘prison’ was only ever used as a quarantine centre for possible yellow-fever victims. Nowadays the island gives you the chance to escape for some peace and quiet. the island is a home to giant land tortoises that were imported from Seychelles in the 19th Century. The tour starts from 9:00am-3:30pm, there you will be able to see the Giant tortoises, beautiful marine creatures, coral reef and it is also a best site for doing Snorkeling.Once on the island ,you have the opportunity to feed and pet the tortoises, some of which are over a hundred years old. If you have time you may also like to take a stroll through the forested interior where you will see a wide variety of birds,colorful peacocks, bats and beautiful butterflies.Keep your eyes peeled too for the shy and elusive Duikers - an unusual tiny antelope species.