"Mystic Isle" Fast, Frequent Service to America's Finest Island Resort. The "Mystic Isle" is the first all steel, all welded passenger boat of its kind on the Great Lakes. 110 feet long, 32 feet wide, capacity 335 passengers and 20 cars. On the Port Clinton Put-In-Bay route from early spring until late in the fall. or a real restful and healthful vacation visit Put-In-Bay.