editor said:
Absolutely worth a visit. I really love the place. A lot of the good stuff has already been mentioned, including the North End with its lovely Italian restaurants (somewhat overpriced) and old-fashioned coffee shops and delis.
Public transit is pretty good, with a subway and streetcar system that will take you to most parts of the city. The last time i visited was a couple of years ago, and i believe they've hiked the prices a little bit since then.
While the massive number of colleges and universities do give it sort of a "college town" feel, you get both the good and the bad. On the upside, there's plenty to do; on the downside, there's lots of self-obsessed undergrads everywhere, jamming the public transport while talking on their cellphones.
Be careful crossing the street. Boston drivers are notoriously bad, homicidal even. Of course, Boston pedestrians aren't too much better, and will blithely step out in front of speeding traffic as if they own the place. The whole process of crossing the road is some sort of high-stakes death match in Boston.
If you fancy a bit of culcha, i highly recommend the
Museum of Fine Arts. It's easily accessible by public transit, and its collections are fantastic. It's a bit pricey ($17), but if you go after 4pm on Wednesdays it's free (although often very crowded).
As others have said, some excellent bookshops, especially for antiquarian and scholarly and academic books. Cambridge is a good bet for that sort of thing.
You can pretty much rule out any possibility of "fall color" if you're going this month. That far north, the leaves were probably all gone a few weeks ago. Even here in Baltimore, a few hundred miles to the south, there are no leaves left on the trees after recent windstorms and then snow swept through. New England has had a cold start to the winter, and all the trees will be bare.