You did not indicate early or late September and I do not know when this campground closes for the season. But if it fits your time frame, you might want to consider the Schoodic Woods Campground in Acadia National Park.
This is near Winter Harbor, much quieter than the Bar Harbor side out on the island. Nice campground, rocky Maine coast nearby. get your fill of lobster.
Chuck Peck in CasaLoca
__________________
|