But there is plenty of open space to play on a big bike if you just want to work on skills, which was his original inquiry in the other related thread. Between the "vintage/peewee motocross track", the open grassy areas, and the easier paths in the chat piles, I think you could have fun on a big ADV machine. Hopefully even $15 worth of fun & skill building.
Note he uses the term "motocross" loosely as there is not a single jump in that track. There are a couple of low rises that you might be able to twist hard enough to lift a front tire for a second.
I would say the same thing about School Creek--could have fun out there on my F800GS, just have to be extra careful what I decide to go down or up. Perry would SUCK except the area outside the woods--and there aint much there.