Away from the coasts, folks might think of ferry boats as antiquated or obsolete. But in the watery parts of the continent, public ferries are still a crucial part of the transportation infrastructure. They connect coastal (or lakeside, or riverfront) communities, and take commuters and students to and from their homes. For visitors, they offer inexpensive cruising through some otherwise spendy waters. These four will take you out on the high seas (or, you know, lake) for pennies.