Great National Parks or camp sites for Eastern States

If you don't need hookups, sites will be very easy to come by if you stay away from the populous places during the weekends. We made a fall run last year starting mid Sept to Niagara Falls and to Acadia by 1 Oct, then back home by mid October. We only reserved at Acadia because there were 3 campers together and hit it on the weekend. We stayed at state parks and NF campgrounds except for two nights when others in our group wanted power.

I hear Gettysburg is worth it even if you aren't into history.