as Claudia says, FYRI:
Gleaned this list from the Fodor's site, good for our planning while in Capetown.
While in Cape Town I would suggest that you don't miss out on the following:
A trip down to Cape Point taking in the penguin colony, a walk in Kalk Bay. and Kalk bay harbour. Here's a great tip ; While on the Cape of Good Hope Nature reserve take the turn off to Buffalo Bay or Bordjiesrif. Definitely worth the short ride. Try and make it to this beach area by lunch time and have a light picnic lunch at the sea. Great experience.
On returning from Cape Point travel via Scarborough an Kommetjie. Wonderful coastline. Also cross over Chapmans Peak which is now once again in operation. Fabulous drive
Other things to do in Cape Town.
Obviously ascend Table Mountain. Try and do this at sunset
Visit Robben Island
Visit the aquarium
Visit Kirstenbosch gardens
Walk through the Company Gardens
Dinner picnic on Signal Hill while watching a sunset
Here's a great hidden secret tip. Visit the daily shooting of the Noon Gun on the Lions Battery at midday.
Take a walk through Bo-Kaap
Don't miss the Africa Café for Dinner and after your meal visit Mama Africa so as to listen to the percussion band at the venue.
Spend an hour one evening at the Drum Café. Unique experience
The Cultural History museum is an interesting venue to visit. The District 6 Museum is also very interesting
Spend some time in the Waterfront but don't overdo it as it is nothing other than a shopping mall. If however you visit the Waterfront on a Sunday this will be well worth the visit as there is always great entertainment and a wonderful vibe in the area.
Visit the Pan African market in Long Street. Interesting experience
Stop in at Zoerienas for a typical Cape Malay lunch in a very local setting. You had better look up the address when you are in Cape Town as many don't even know about Zoerienas
Visit the Mount Nelson Hotel for high tea. 14h30-17h30
I reckon that the above should keep you going in Cape Town.