If you enter the Denysville town then carry on straight till you get a board with a boat on a slipway turn left and bob is your uncle. I think they charge R80-00.
The other place you could try is , as you go over the vereeniging ,villiers,vaaldam crossing from heildelberg side there is a place next to Steyns Rus can't remember what it is called.......starts with a B. There it is R120-00.