ZANZIBAR EXCURSIONS - STONE TOWN + PRISON ISLAND:
Visit the city of Zanzibar, and see the ancient architecture of the Stone town (built from coral stones,) walk through the famous alleys of Zanzibar, see the hanging balconies, Zanzibar's doors, and visit the market, to hustle and bustle, with the local people, while buying various commodities, visit the House of Wonder, Old Fort etc – one can also get good souvenirs from Gizenga street, which has a variety of shops selling from tinga tinga painting, to small replicas of Zanzibar's chests and doors.
After lunch, get into a boat from town, to ride through the prison Island, where you embark, and get a chance to see the famous, huge tortoises (aldabra species), where you can feed them, and not shy, from there you will visit the prison (which the island is famous for) and then you can relax on the beach, where you either snorkel or sunbathe.