You can also spend a day visiting different Island around Zanzibar, we went to Prison Island (also known as Changuu), which was a prison for rebellious slaves, since Zanzibar was a popular slave market (Zanji in Arabic stands for slave; Zanjibar). It is also a home for giant tortoises (turtles) who have been there since 1919. Four tortoises were gifted by the British, the bred quickly into 200 tortoises by the year 1955.
Click here to learn more about Zanzibar Island.