I did the High Falls Loop last October, and although it wasn't as challenging as the rugged PA trails I am used to, it was definitely gorgeous. The loop itself is ~20 miles, but I added a couple side trips. One of them was up a small mountain. Here's a link to the TR I wrote up for it:
I hope you aren't planning on doing much hiking there until at least the end of June, maybe even later - from what I've heard, they are having an insane black fly explosion this year.
If you have any questions on the HFL, feel free to give me a PM