Fergus Kelso and I spent some time at Mt Gambier during the Summer and found about 5km of trails around the Crater Lakes, on the right side of Keegan Drive. Great views and good trail, so if you're down there with some time, check them out. Unfortunately it's not really worth the trip on its own

Here's a short video we made riding there:
http://www.youtube.com/watch?v=OOP39LDy ... ce=message