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Boston has an extensive subway and bus system that can get you to almost every tourist location. Locals call the subway the T - you can find the stops by large Ts in circles.
The T's Boston Visitor Pass give you unlimited subway access for $6 a day; $11 for three days or $22 for a week. The MBTA Web site can tell you how to get to key attractions by subway; another site can give you an idea of how long it will take to get from A to B.
One drawback of the local subway, at least for bar-hoppers, is its hours: The last trains leave downtown around 12:30 a.m. (even though bars in Boston can stay open until 2). On Friday and Saturday nights, the T runs Night Owl buses along subway routes every half hour between 12:30 and 2:30 a.m.
The MBTA's commuter rail can get you to more remote tourist attractions, such as Concord, Rockport and even Providence, R.I. However, on some lines, schedules are particularly geared to getting commuters to and from Boston (i.e., trains out of Boston will be far between in the morning and trains to Boston will be infrequent in the afternoon), so plan accordingly. By Boston-online.com