East coast trip heading south

Well we will spend the fall (September to mid November) working our way down to Florida. Want to start some where in Maine. will spend most of the time in a truck camper than switch to fifth wheel from south Carolina down. Interested in the scenery,camp grounds can be state, national or private. Boston is a City we want explore for sure. Smithsonian will be a must stop also. Any suggestions on any stops along the way is greatly appreciated.