The eastern half of the island is best navigated using Route 3, which forms a rough loop from Bar Harbor through Seal Harbor and past Northeast Harbor, then runs up along the eastern shore of Somes Sound. Route 102 and Route 102A provide access to the island’s western half. Without a car, use the free Island Explorer shuttle.


The Thompson Island Information Center, on the right as you are about to cross onto the island, is your single best info source. It’s open daily from mid-May through mid-October. Acadia National Park information is available daily, year-round, at the park headquarters (tel. 207/288-3338) on Route 233 between Bar Harbor and Somesville. Locally, the Southwest Harbor-Tremont Chamber of Commerce (; tel. 800/423-9264 or 207/244-9264), and the Mount Desert Chamber of Commerce (; tel. 207/276-5040), can also help you.



Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.