A proposed itinerary can include the following :
Enjoy a Visit to the Island on which Nelson Mandela spent 18 years of his 27 year imprisonment. A short Ferry trip before touring the Island and Cells conducted by ex-inmates before returning to the Ferry terminal at the V&A Waterfront. After Lunch head towards Table Mountain for a Cable Car ride to the top and a walking Tour on top.
Heading down to the City viewing the Bo-Kaap with its very colourful houses and time permitting a drive around the City Centre.
I normally Advise the First 09h00 Ferry as it often runs more to schedule than later Ferries although the Day can be made to fit whichever Ferry is available. These Ferries often become Fully Booked well in advance especially in December and January so best booked Well in advance.