If you aren't in the mood to trek out of Boston, hop on your bike and explore the hidden parts of the city you rarely see by car. There are several bike tours like Urban AdvenTours or Boston Bike Tours that take you on special guided tours through Fenway, the Avenue of the Arts, Back Bay, the South End, Copley Square, Charlestown, the North End, Beacon Hill, and along the Esplanade on the Charles River. You haven't seen Boston until you've seen it through the eyes of a biker.

Cost: Free on your own. Tours range from $30-$75
Duration: A few hours