Advice Sought on Things To Do in Cape Town

As the day counter to our SA trip now seems to count down more rapidly I've been trying to firm up an agenda for our three days in Cape Town. I know, as someone said, that to plan early is to plan twice but I'm looking for very specific advice;
1. Is the Robben Island tour worth it? The Tripadvisor reviews vary widely on this...
2. We want to do a winelands tour, preferably as a private group. None of us want to be the designated driver for this. Can anyone recommend a company that we could use for such a tour?
If this has been discussed in any previous threads, please just point me at them. I did a search and couldn't find anything specific...
Thanks
Paul
1. Is the Robben Island tour worth it? The Tripadvisor reviews vary widely on this...
2. We want to do a winelands tour, preferably as a private group. None of us want to be the designated driver for this. Can anyone recommend a company that we could use for such a tour?
If this has been discussed in any previous threads, please just point me at them. I did a search and couldn't find anything specific...
Thanks
Paul