Trip recommendations -- PA

I'm looking for a central destination for 2 guys in WNY, 1 in CNY and 1 in the DC area to meet in Pennsylvania and do maybe 30--35 mile backpack over a 4 day period in late April, early May. All experienced backpackers. We can drop cars as needed. Hopefully we can find a suitable destination that's scenic and not too crowded although we don't need complete isolation.

Any suggestions ?