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Large car-and-cargo-carrying ferries are a great alternative to cruise ships for exploring coastal areas. They're usually cheaper (but in most cases you can still book a cabin with loo and shower for longer journeys), and because they are smaller, you are closer in to shore, so the scenery is better.
Car ferries are also a good way to get from A to B, and commuter ferries can give you a different slant on a city.
Navigate: MustDoTrips homepage -> Catch a ferry