I used to live in Vermont, and Boston is where the RED SOX are, so of course I have made a few trips in my lifetime. I am no expert by any means, but there are some really wonderful things to do there. Here's a decent web site for you.
http://www.boston.com/travel/boston/
I love the Boston Museum of Fine Art and the Boston Aquarium. Of course Faneuil Hall is a must-see so you can shop till you drop!
I met my son (who still lives in VT) for a weekend in Boston in October, and it was a blast! Enjoy!