Looking for nice juicy offroad route from Joburg to Barberton or Kosi Bay

[Xpat]

Oi. As the title says and little bit last minute I'm looking for nice offroad route from Joburg to either Barberton or Kosi Bay. I will be on KTM 500 so ideally would like to find a route that will be fun on that. I will route normal dirt roads on Google maps myself, but am interested in those single / double tracks that may not be visible there.

Thanks in advance.