We stay at Ohio's Pymatuning State Park every year. It is located right on the lake. All sites are paved. The park is really well kept. The nature program is our kid's favorite. Deer Park is nearby (petting zoo), pontoon boat rentals are cheap. It makes for a fun weekend getaway.
This is a decent campground, however the sites are one of the smallest I have seen in the state parks system. The facilities were clean, but a little worse for the wear. I would stay here again, but probably won't.