Did you do any of the loops?
We did an 8km one and a 5km one at one of the camp sites. Awesome fun.
Might have to go for a drive and hang out there for a day. One place had 3 different loops from beginner to expert. There used to be some north shores set up behind Mundaring years back at little ovens. Not sure if they're still there. They were heaps of fun. Had the 4X4 and rotated runs for driving. Ended up being a race between my car and the bikes.

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Have Fun.