Hi There
I go to Boston approx 4 times a year for work and have done for 20 years or so. Things to do are in no particular order
Walk on Boston Common
Freedom Trail
Aquarium
Duck tour (WW2 amphibious vehicle) from Prudential building
Faneil Hall Quincy Market food court and fun shops
Sell your wife and kids and get ticket's for the Red Sox (kidding really it is impossible to get tickets)
After a good meal, miss out the desserts course, walk to the Italian quarter and find a bar serving drinks coffee and desserts
Eat in China Town - really good food here.
Union Oyster bar is superb but can be hard to get a space at the weekend.
Visit Rockler tool shop in Cambridge
Museum of Science is world class
Visit Concord and get a bit of American flavour history - should be flavor really
I'd miss out the Tea Party as have not heard good things about it but I have not been.
Hope this gets you started.