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Gdańsk’s Maritime Museum is made up of four individual museums that together create a complete history of the port. Straddling both banks of the Motława, tickets can be bought individually or together for an unsubstantial discount. A ticket for all four museums currently costs 15/9zł and includes a free ride on the ferry which sails the short distance between the Crane and the Museum opposite and now operates all year round (subject to weather). You can save yourself a 10-15 minute walk even if not visiting the museum. Tickets cost 1zł.
For more information go to:
http://gdansk.inyourpocket.com/sightseeing/category/59713-maritimemuseum.html