Acadia National Park makes up half of Isle au Haut in coastal Maine, where visitors can spend hours exploring the 18 miles of trails on the shoreline and hillsides. By day, check out the park and ponder the sea, looking for dolphins, seals, and whales as well as lobstermen hauling their pots. By night, stay in the third-floor garret of the Keeper's House Inn (207-460-0257, keepershouse.com, $385, including meals), attached to the Robinson Point Light, also on Isle au Haut. The inn is lit with lanterns and candles only.- Patricia Harris and David Lyon
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