This 10-acre marine park is reachable by car or boat. The park features 685 feet of saltwater shoreline on Mystery Bay and offers a spectacular view of the Olympic Mountains. The name “Mystery Bay” derives from smuggling activity on the island during Prohibition days. Transporting booze from Canada was a profitable and somewhat honored occupation in the remote waters of northwest Washington. Sequestered between Marrowstone and Indian Islands, Kilisut Harbor was one refuge used by smugglers to evade Coast Guard vessels.