Concord/Lexington Battlefields.
JFK LIBRARY.
BOSTON HARBOR.
Bunkerhill monument then go down to the Old ironsides, walking distance. Do the freedom trail downtown walk, and take in the Boston Commons, ride the swan boats, ride the duck boat tour of downtown. Take in the gardner museum & bostom museum of fine arts both walking distance. You will Love the science museum. Visit Salem or Plymouth. fenway park if you love baseball. Lots of things you can do. Enjoy the trip!