is the biggest skatepark around. It's not too far from Kilborne/Eastway/Sugaw, or at least sorta on that side of town. There used to be one on Shamrock at a church (I think) not too far from Grayson, and kinda towards Eastway from Grayson. Google doesn't seem to know about it, so it may not exist any longer. I just remember the ramps were blue, and it was referred to as "The Blue Ramps".
I did just run across this
which has a map you could compare to the course locations, if that helps.
And the track at Hornet's Nest is just that, a BMX racing track, and nothing else.
Oh, and Alpine Ski Center is great.