x2 (at least) on Driftstone on the Delaware. Some of the sites (back-in, water & electric) are enormous!! Our 34' TT was dwarfed by our site, which backed up to the river. Plenty of shade but the trees were way out of the way of the camper, awning & slideout. Our site was #8, in case this interests you.
We have also been to the Allentown KOA and it's likely the best (by far) in the area. Lots of shade in many sites (especially the electric-water ones), it's in a pleasant little valley, has a pool, etc. Far enough off the main roads to have little road noise. Deep enough in the valley that cellphone service can be tricky.
Another we liked in eastern PA was the Gettysburg KOA. Again, shady (can you tell we were traveling in the summer?). Clean grounds, covered with river rock (about 2-3" diameter) so the footing is a little interesting. Off a country road, rather than a main road, which has its definite advantages as well.
