There is a route called the Toeka loop. Head out of Clarens on the R712 back towards Bethlehem. Turn right on to a sand road labelled the S205 follow this road and the "Toeka" signs and you end up doing a 45km loop if you start in the town. Can also head out of Clarens towards Fouriesburg and there are a number of dirt roads along the way to explore. Rebelie game farm on the way towards Golden Gate has a 4x4 track that they allow day visitors to ride. I think it was R40.