Decent for an after-work run/walk
This is a decent park for a casual, after-work run or walk, and a quaint family picnic. There are various watercraft, I'll say, that you can rent to use in the lake.You can also fish, but I also know nothing about fishing, so I couldn't tell you what kind of fish are there. This is a park of the same caliber as Central Park: nature, but not wilderness, and minimal risk of getting lost or encountering bad elements.
I am leery of coming in contact with the water and eating the fish. Near the damn there is a small, paved, decreipt asphalt lot with wood chippings and treated wood. I am currently trying to get to the bottom of what pollutants these wood treatments may contain. Also, the Pennsvaylania Department of Environmental Protection has determined that the fecal matter concentration of the water exceeds acceptable amounts...but chalked it up to the very large geese population.
Peace Valley Nature Center seriously needs to hire a janitor. That place is gross.
Watch out for bikers! They hardly ever warn you when they're "passing on the left/right" I noticed that at Tyler State Park they are more conscious of that, though.