When I was there in 2001 I did loads of things
Table mountain you can climb up…no need for the cable car.
On long street there are many offices that can book you on escursions etc.. I did quad biking (proper race ones), A brai on a sailing yacht overlooking the bay, we then got picked up in a semi inflatable and ragged that on the sea chasing dolphins and then clubs and strip joints..
Grear white shark diving was one of the most incredible things I have ever done…..but this is now frowned upon as there are many people with boats doing this causing problems.
Robben Island was a bit meh, so if you cant go dont worry about it..
Then you have cape point great beaches etc..
Stelenbosch and the wine regions are great, there is one with some cheetahs and you can pay to go in the pen and stroke them..
On the garden route, the bungie jumps was a laff, also there are some caves and dont forget to go to the ostrich farm and have a go riding one…I nearly got killed, but ostrich burgers are ace.
Enjoy