We stayed at one of two walk-in sites at Greenwood. The highlights were a spacious camp site, nice bathrooms, little light pollution (we saw the Milky Way!) and hearing screech owls at night. 

A couple of really nice things about this campground: You can buy ice ($2), bundles of wood (15 pc @ $5) and as long as you don't need change, it's self serve. The shower house is nice, nothing too fancy but clean. There's also a toilet-only bathroom closer to the walk-ins with a mirror and a baby changing table. It was VERY clean and heated, which was glorious considering it was quite chilly at night. There's also drinking water spigots in several locations which is a big plus and not something you see a lot in most state parks.

The walk-ins are not very far from the little parking lot, so it was easy to carry our gear down to the site. The site itself was HUGE in comparison to the other sites. Also close to a nice little stream.

There were a few big puddles from this summer's torrential rains but surprisingly no mosquitoes to speak of. The only con about this campsite was that it's down the hill from PA 305. It was fine during the night, but traffic started to pick up at daylight. Maybe it would not bother everyone, but it was annoying to be reminded you're right next to the road all day.