You can get on a "repositioning cruise" from Boston in the autumn each year. Cruise ships sail out of this port in the warm weather months, so for the winter they have to move to another departure port. The move is called a "repositioning cruise". See the calendar of departures below.
Repositioning cruises are usually bargains, because one-way cruises aren't as popular as round-trips. Out of Boston you can take a cruise to a warm place like California, Puerto Rico or Florida. Spend a little extra time there, then fly home.