And then K fell down in the roughed-up un-zamboni'd ice and hurt her knee and neck. So... ugh. It was worth a shot anyway.
On the plus side, the walk there (from the ft. hamilton expy F/G train stop across the bottom of the park) was really pretty with the lake all frozen over and misty, with various birds puttering around. Also we got some barbecue in fort greene ("the smoke joint", brisket sandwich) afterwards that was tasty.