This past October I thruhiked the Loyalsock Trail (PA). I think it is one of the most diverse trails in the region with many waterfalls, gorges, views, big rocks and some excellent campsites. It is also a challenging trail with many climbs and descents, some are steep. The LT is also one of the older backpacking trails in the country. I put together a condensed online thruhiking guide for those who might want to hike this trail.
Backpacking the Loyalsock Trail | Endless Mountains Experience (wordpress.com)