Climbing Lion's Head was the best thing I did in Cape Town, sitting out on the rocks in the early evening was a highlight. Not only is the view fantastic but you also get the satisfaction of knowing you climbed all the way to the top to see it. Seeing the city laid out beneath you and Robben Island in the bay, puts life into perspective especially in a city as thought provoking as Cape Town.
Updates
Yes! Lion's Head is just sublime. Heading up there to watch the sun set is right at the top of things to do while in Cape Town. You're surrounded by nature and the views are breath-taking. It's free. Take a bottle of bubbly, put on your walking shoes, and take it all in.
Is this your business?