Tours:
R100 each for a day tour.
Safaris, R120-250 for your guide per day and half that for the tracker.
Restaurants:
10% (a little more for fine dining).
Bars, tipping is not the norm. Loose change will suffice if you must.
Other:
R20 airport porter (in OR Tambo official accredited porters are identified by an orange shirt, black cap/pants outfit with ACSA id tag).
Car guards R5.
Taxis:
10% for higher fares, or round up for smaller fares