Sounds like Isle au Haut . . . part of the island is part of Acadia National Park . . . much like Schoodic Peninsula, it's part of the national park that few visitors know about or go to. To be honest, I've never been there myself, but I've often thought it would be good for a visit.
http://www.isleauhaut.com/
http://www.nps.gov/acad/planyourvisit/duckharbor.htm
That's it. It was near Acadia. Word is out now.
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