We spent the night in Ludington, MI before our morning crossing to Manitowoc, WI. There are valets who drive your car aboard, and you can leave your luggage and everything you don't want to carry on inside your car. The boat is fun to explore and there is a movie room (kid friendly movies), a TV lounge and a cafeteria-type place where they have family activities such as bingo and face painting, all making the 4 hour trip go by quickly. We would also recommend the ship museum in Manitowoc, with tours on a submarine there.
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