Boston Rocks (but I'm partial).

I agree with much of what has been posted. My priorities would be:

1) Walk Beacon Hill.
2) Take the Duck Tour (even though they used to annoy the !$*&! out of me in my cab-driving days). Book in advance--they sell out each day.
3) South End or Cambridge are more interesting for dinner than Quincy Market.
4) See the Red Sox. Fenway Park may not be here a few years from now. Sellout? Buy through an agency--they'll have tix for a price.
5) Take a sunset harbor cruise.

Email any of the Boston folk here for the real scoop!