Boston is an Amazing city, love it. We spent 5 days there in January this year.
Trolley Tours- Great way to get around the city and all the stops are worth getting of at, a great way of getting around.
http://www.trolleytours.com/boston/day-tour-boston-mass.asp
Fenway Park tour; Did'nt know anything about baseball, did'nt know who they were talking about, but loved it, great way to get into the game.
It's also one of the stops serviced by Trolley Tours.
The Freedom Trail; Great History lesson, really enjoyed it, very patriotic! They love the fact that your British and your listening to there side.
http://www.thefreedomtrail.org/
Vapiano; Great place to eat, good value, good food.
http://www.tripadvisor.co.uk/Restau...192-Reviews-Vapiano-Boston_Massachusetts.html
Boston Public Library;
A stunning building inside and out, worth taking a walk around and inside really beautiful.
Prudential Centre;
Great if you like heights, stunning view of Boston.
http://www.prudentialcenter.com/shop/shop_detail.php?id=64
Just a few to get you started, any help or advice just ask, love talking about Boston.
Check out what shows are on as well whilst there they have some lovely theatres if you like that kind of thing.