Best place to start is end of boronia rd, go past gate, turn left at fire trail T intersection to the top of hill and look right, you will see a trail, head in there and veer left, this is crank it, probably the best track for flow.
Rock trail is quite technical. To get there go to previously mention T intersection, turn right and trail entrance is 20m on right. Follow and it will bring you out right near cars.
Bendi is very nice, but unless you know how to get there can be hard to find from boronia, best parking at the end of old Kent rd and taking the gate on the left just after the divide in road stops ( this will make sense when you get there, after gate trail entrance is about 400m on left, entrance to bendi is about 200m in on right, marked by two parallel logs, you can't miss them.
Hope this helps, would come out and show you round but I'm going away.