Maybe a nice alternative is a dive at the Two Oceans Aquarium. Here you can dive in between some nasty looking sharks with your friends looking at you from the other side of the glass. I work for a tour operator that offers these and other diving activities. Other suggestion for Cape Town in 1 day, is the much marketed "Big 6"
-V&A Waterfront (if you love shopping try Canal Walk, biggest mall in Africa);
-Robben Island (book early!)
-Table Mountain (weather permitting but open 90% of the time, when are you going?)
-Kirstenbosch Botanical Gardens (truly great!);
-Constantia (if you can visit the Winelands rather)
-Cape Point - the most south-westerly point at the Cape of Good Hope (if you have time Cape Agulhas is much further from town (about 4 hours) but the real southern tip of Africa and the actual meeting point of the Indian and Atlantic Oceans, although some might say that's debatable).
QUOTE(rangers234 @ Dec 17 2009, 05:33 PM)

im travelling for a month zambia to cape town and I have an extra day in cape. Would love some suggestions on what I must see. I was considering doing the shark dive can u still do it without doing the dive?Also how long does it take because my flight is at 8pm so will have to be at the airport around 530.
thanks
roy