Judging from recent magazine articles and postings here, there may be a bit more to getting checked out for SA (assuming you start with a CAA, JAR or other ICAO PPL) than there is for, say, the US, but Irv Lee at Popham has the requisite South African qualifications to check you out and sort out the paperwork before you go. Have fun, and please tell us about your trip, as it's one I'm thinking of for next year (or might do Oz instead).