How many of you have been there? Because please don't come here posting crap about something you know nothing about.
I lived in Joburg for a while and visited Cape Town- Cape Town is MUCH safer (i.e. most things are not behind walls with guards like they are in Jo'burg)
Obviously there is Table Mountain- a walk/ ride up to the cable car station and then a cable ride to the top is a must... Go early though as high winds and fog often close the cable car later in the day.
Lion's Head is also a good climb if you're feeling fit.
There are some nice restaurants around the V&A Quays- can't remember any specific names right now- will post back when I think of their names.
I also did a helicopter ride in an open- sided ex-army helicopter- This was absoultley amazing- the different kinds of scenery were awesome (Make sure you get one of the side seats and take your camera!!) The pilot is excellent and takes you on a low level flight over the beaches, around the mountains (and between them), and right over Cape Town. We even saw a shoal of whales just off the coast! It cost about £90 a ticket, but was well well worth it!!
Clubbing- wise, try Hemisphere at the top of one of the tallest towers in Cape Town- Nice place, full of hotties, and awesome views. Green Point is also good. The name of the main road with all the bars escapes me, but I'll look it up and get back to you.
Other things to do in the region include Shark Diving (Good, but unless you have a strong stomach, I don't recommend it, as you will get very seasick, and the water will be freezing at the moment!), and some excellent wine- tasting in the nearby vineyards.
Got to run now but will post more and some pictures I got on the chopper ride later...