The best way to spend a day — or get oriented for a week — in Acadia National Park is to take this 27-mile scenic route that makes a lazy round-trip tour around the eastern half of Mount Desert Island. Beginning at the Hulls Cove Visitors Center, it takes in many of the parkâ€Â™s most impressive sites, including the Native American museum at Seiur de Monts spring; the spouting blowhole known as Thunder Hole, where kids can clamber around the ocean-side cliffs (under strict parental supervision); the dramatic views of Otter Cliffs, which have been adopted as a veritable symbol of the park; and the auto route up to the top of Cadillac Mountain, a rocky summit with walking paths and gorgeous views of the park and surrounding islands. Pick up a guide to the park along with an entrance pass good for seven days at the visitors center, located on Route 3 between Bar Harbor and the bridge to the mainland.