It was a beautiful route, courtesy Rubel's Pocket Maps once again. The route picked up at the Bedford end of the Minuteman path and took me through Lexington, Carlisle, Bedford, Acton, Concord, etc. The destination of sorts was Nagog Pond, a public water supply lake in Acton with no public access. Very pretty, though.
But man it was cold! It was dark and about 22 degrees when I left the house, and it only eeked up to about 33 by the time I arrived back home. Because it was pitch black until around 6:30, I opted to avoid the bike path until Lexington. And in that first half hour, both of my water bottles had already frozen up substantially - an hour later they were completely frozen! At least I was dressed warmly enough, except for my toes, which were pretty cold all morning.