The striking, craggy coastline of Maine's Acadia National Park has been an enticing destination for travelers since it was first declared a national park in the summer of 1916. On Mount Desert Island, three hours up the coast from Portland, deep cobalt waters crash in foamy waves against granite cliffs and mist-shrouded beaches. The great northern woods roll down hillsides to meet the Atlantic Ocean at the easternmost reach of the United States.…