The Water Street Garage between Water Street and Atlantic Street across the train tracks from the ferry pier is convenient. Give yourself extra time to walk a block North in order to cross the tracks.
Get there early ( about an hour ..for the 830 boat..)for a closer spot at the terminal..
If the parking lot behind the ferry is full, there is a parking lot right across the street from the train station. Visible from the ferry
Uncovered parking lot at the ferry dock
There’s a parking lot right by the ferry
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