Bike Polo in Roosevelt Park
If you're yearning to give your two-wheeler an alterna-preppy workout, try tangling with the city's bike messengers at this LES free-for-all. The game is three-on-three pickup and all are welcome: Just grab a bike with short handlebars and hair-trigger brakes, duct-tape some plastic pipe to a ski pole and strap on shin guards and a helmet. You'll want to put as much between you and the pavement as you can.