...that should be for longer than most people can spend. Explanation: The ferry service's last return is about 5 PM -- in the summer! If you have your own boat, no problem. (No one can sleep over.)
Anyway, it's big enough to take hours to explore, and historic enough to be worth researching a little bit before going, to give it that "third dimension". There's a fort that has had multiple uses over the last two centuries, including a prison, and actually acquired a ghost. There's a museum that authentically, professionally represents what life was like for various types of occupants over the years. There's fishing (BYO tackle). There's a walk-up food place operated by a Boston seafood restaurant company with food that's a cut above normal such fare. And there are events such as period plays and concerts.
Perhaps best of all, to this reviewer, it can be one of the only fresh locations in the Boston area on a hot, humid mid-summer day.
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