Not directly related to flying, but if you're planning to hire a car (which is basically a must), check out some of the local operators, as they're often cheaper than the big-name internationals (Avis, Hertz, etc) - try
www.kulula.com . If you do plan to go with one of the big companies, book from here before you go, as it works out rather cheaper (from experience), and you generally get a better deal anyway.
Also, if you're planning to fly domestically (Cape Town to Johannesburg, for example) again, check out the smaller local operators, most of whom allow you to book online - again kulula.com, and there are a few others.
As far as sight-seeing goes, there's the Garden Route (basically a drive up the south coast), Wilderness and Knysna are stunning. Alternately, if you fancy something a little closer, try Hermanus - it's a bit touristy and expensive, but it's still a beautiful seaside town (also great for whale-watching). There's also loads of wine-tasting to be had around CT - Stellenbosch is just along, with way more wine farms than you'll get to; also cheese and berry farms and a brandy distillary. If you don't mind a bit more of a drive, Paarl and Robertson offer better value wine, but with a little less choice.
If you're planning to fly yourself, I believe you need to convert your license to an SA one, which is supposed to be fairly simple. If you'd like any more stuff-to-do ideas, drop me a PM
