Stone Town & Spice Farm Tour (Full day). Zanzibar is known for its spices, and its past is very interesting, in part because of the spice trade. Visit some of the town’s most famous historical sites and buildings, like the slave market and the Sultan’s Palace, on this trip. Then, go to one of the many spice farms that are all around the city. Find places where different spices grow and taste, smell, and touch them all. Then, see how many you can name.