Cape Town is big when thinking of what to do. Where are you going to be in CT? Do you have a car?
This is something to do for the Western Cape with kids, but much applies to if you do not. http://www.safariguideafrica.com/family-things-to-do-in-the-western-cape.php
Write back with questions and I will try and answer them. about 8 years ago
Go for a long lunch at a restaurant in Camps Bay.
http://maps.google.com.au/maps?hl=en&q=camps+bay+cape+town&ie=UTF8&hq=&hnear=Camps+Bay,+Cape+Town,+Western+Cape,+South+Africa&ll=-33.946066,18.407936&spn=0.102246,0.191746&z=13 about 8 years ago
depending on the weather, try to climb Table Mountain - views are amazing and its a rewarding experience. If you have time and a car, have lunch in Sea Point or Green Point, but if you have a bit longer, a drive to Camps Bay for some seafood is a must, the most amazing coastline you will ever see. about 8 years ago