This is last minute, but anyone who hasn't gone to the community skating rink in Kendall Square -- I tried it on a below-zero, windy day and still had fun -- can get in on it for the last time, this Thursday, for FREE. It's between second street and Athenaeum, and there's parking nearby. Skate rentals are also free this Thursday from noon to 8.
Mark, in case you weren't aware, I'll likely be dragging you to this:)