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.