+1 for Rothrock ... It's near Penn St and yes, it is rocky ... Very rocky actually. You also have Glen Park which is a great little gem near Stroudsburg, Hopewell Bike Park in Danville and then out closer to Pittsburgh there's Alemeda in Slippery Rock and Moraine State Park. Only spot I haven't been to is Hopewell, and my favorite of the bunch is Alemeda, with Glen coming in at 2nd ... Rothrock is awesome too, but that's not so much my preferred style of riding. I'm to outta shape I guess, and the rocks seem to never end.I'm driving through Pennsylvania soon. Are there any suggestions on MTB/hiking trails, campgrounds and stargazing spots along I-80?