A cold autumn rain didn't dishearten the 15 or so of us who had signed up for a 2-hour canoe trip on the Bronx River. While the mighty Hudson forms the western border of New York City, most don't realize there is only one actual river IN the five boroughs, and the river lent it's name to the borough around it. It's not a mighty estuary or a rushing torrent. It's not much more than a stream for some of it's length. But it is navigable. And every few weeks, the Bronx River Alliance hosts a group paddle down the river. It's a chance to experience NYC in a way you never expected, aimlessly paddling through a tunnel of green, or if you go in October like I did, a tunnel of green, yellow, orange, and red.