Boys would love the Liberty Bell, and there's a great science museum there, very hands on. Boys would also love the Boston Pops and putting their history in context around the Boston area. As much as I love Newport, RI, for boys I'd do Mystic Seaport, CT, instead. An amazing aquarium/amusement park with rides or get in the water with a dolphin and the Seaport with tall ships and Long Island Sound beaches and.... Go up to Gillette Castle where an actor designed a different wooden lock for each door and set up elaborate reflecting decor to spy on anyone who came to his door or guests who went into his liquor cabinet. Williamsburg, VA, is also very hands on for boys; and you can always treat them to Bush Gardens before you go home!