Twenty-three-mile ride along the Charles out to Waltham and back. On the way home, I ran into about two dozen bikers from the Appalachian Mountain Club. I’m a member, so I’m going to have to check out their events. Anyway, I rode with them to Alewife Station before splitting off to head back. Great people, plus they showed me the best connection between the Watertown-Cambridge Greenway and the river.