someone was asking about this stuff a few weeks ago. here's a quick clip. i believe we did 55 miles of riding that day. 35 of it was singletrack in one direction along the rim. then we had about 20 miles of rail bed along pine creek on the way back. great stuff our there. it hasn't been ruined by leaf blowers yet.
So I'm guessing that the ride was mostly on the West Rim Hiking Trail.
I always thought the handful of 'State Hiking Trails' (Quehanna, Donut Hole, Chuck Kieper... full list: http://www.dcnr.state.pa.us/forestry/hiking/index.aspx) where off limits to bikes... I'm not sure where I got that idea, but I would love to find out that my assumption is wrong.