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Isles of Shoals Steamship Company offers 3-hour harbor tours that include a trip out to the Isles of Shoals. Trips sail at 9:55 AM and include the Portsmouth Naval Yard, the Naval Prison, several lighthouses, historic forts, and stories of shipwrecks, pirates, ghosts, and more. The M/V Thomas Leighton is a Victorian steamship with three decks of indoor and outdoor seating. There is a bar and snack bar. Seasonal from mid June to Labor Day. Schedule is subject to change based on Mother Nature and customer requests.