What are the top 10 things to do in Boston?

I am going to Boston for business (only 3 days, but 2 nights). What should I do? I will be in the Boston Mariott Copley. Seems to be in downtown region. Any tips?

1) Go to a Red Sox game, if they're home.
2) Go to a Celtics game, if they're home.
3) Boston is a great museum town. Check them out.
4) Lots of restaurants there serve outstanding clam chowder.
5-10) Check and double check outbound flights.

Quincy Market and Fanueil Hall are a must see. There are push-carts and street performers. The following website details other fun things to do in Boston -
http://www.sic.org/links.asp

Enjoy!

Go stroll and shop down Newbury Street, which is near copley! Also, Faniuel Hall and Quincy Market are fun! The North End is good too.

Ride the duck boats!

If you haven't had dinner in the North End (Italian neighborhood) followed by gelato, you haven't lived
If you're not into upscale stuff you should try the original Pizzeria Regina (best pizza in the world...)