Ike B.
Google
This is a very interesting stop for those who are history buffs, others may be a little bored by it.
This is the original palace of the sultans completed in 1832 and was home to all of them, their concubines and family until the 12th sultan fled to the UK in the Zanzibar Revolution.
It has period pieces and some copies on display of trade pacts, armaments, cars, furniture (most of the display is furniture) from the sultans.
A few of the stops along the way have beautiful views of the ocean.
Worth a look.