Kim and I visited Hickory Run State Park this weekend. We checked out Sand Spring Lake and hiked around it, then went to Wawa for cheesesteaks, then came back to the park and hiked on Hawk Falls Trail.
Hawk Run is a little river that's a lot like St. Peter's Village (which is in/near French Creek State Park), with big rocks in the river so you can hop down the creek itself instead of walking on the trail beside it. The rocks are mostly smaller and fewer than at St. Pete's, at least for the stretch of Hawk Run that we saw, but it was still a lot of fun.
We ended our hike at Hawk Falls, which is a waterfall that's about 20-30 feet tall. It's really neat, extremely loud, and the water at the bottom is plenty deep enough to swim, if only it hadn't been a cool day (and if the water hadn't been frigid, since it's mid-October). The waterfall looks really small in the photos for some reason; it seemed much bigger in person, maybe because of the noise.