Tours
The most popular organized sightseeing tour is the Marrakech City Tour, a hop-on hop-off sightseeing tour using regular dedicated buses on two intersecting routes with a 48hr ticket for unlimited use on both.
Bicycle Tours are another option, or you could organize your own tour by taxi (a petit taxi for up to three, a grand taxi for up to six), or by calèche (horse-drawn carriage). In either case, make sure the driver knows exactly what you want and fix a price in advance.