Just in case you didn't see the issue of ATV Action that I just picked up... there is an article that lists 12 riding place in Pennsylvania. They don't give much info other than who you can contact, but I figure it you want to ride bad enough it may be worth $5 and a few phone calls.
Not sure what month's issue this is, all I know is it was in Wal-Mart.
Don't know if this is much help, but I do what I can.

 

Wood Warrior,
I don't have access to that magazine in my area, but would you be so kind as to post those 12 places for me? My accomplice and I have been working hard on trailmaps and places to ride on PaAtving.com and can always use more ideas for riding in the Keystone state!

 

I just saw your post today. I will try to remember to bring my magazine in Tuesday and post them. I will add them to this thread.