Ooh - if you stop in Boston you have to do the Duck Tour! I was downtown yesterday & reminded of how fun it was when I saw the boats all over town! It's great fun - especially for a kid at heart
http://www.bostonducktours.com/ Oh - and in terms of cuisine, don't forget the seafood! New England Clam Chowder, Maine Lobster, fried clams, fried shrimp, fried anything, really....