The road crosses the Kouga River twice. At each crossing there is a guest farm. The crossing nearest Joubertina is about 12 km from the town. I believe he also offers hiking and canoeing - but I have not seen the place. Rodger advises that cycling would be best in spring.
Summer is certainly too hot.
It is only 9 km, taking in superb sea views. There are very good information boards - and its well marked. At the parking area there are braai facilities and a very clean toilet. Millwood and Jubilee Creek are interesting, but I have not been able to get really enthusiastic about people mining in the forest. The picnic site at the creek where gold was first discovered is super.