Check this Wikipedia article out for ideas on which countries your South African passport allows you to travel to:
http://en.wikipedia.org/wiki/Visa_requirements_for_South_African_citizens
You can also get a visa on arrival at these destinations:
Bangladesh
Burundi
Cambodia
Dominican Republic
Ethiopia
Indonesia
Laos
Madagascar
Nepal
Oman
Tunisia (I spoke to the embassy in Pretoria and they said that although it is preferred to get it before going to Tunisia, I probably won’t be turned away from the border if I try to get it on arrival)
Turkey (now free on arrival)
Uganda
