We spend the summers in Maine and Michigan. Usually July and part of August in Maine , then head to northern Michigan till we return to Fl. We stay at resort type places, so can't help with the price range you are targeting, but check out coastal areas of down east Maine and area around Traverse City, MI for parks the suit your needs. If you want to go further north, into the UP of Michigan, there are some nice state parks and one place I liked was the town campground at Munising, MI.. near Painted rocks national lakeshore.
