During the TD Five Boro Bike Tour, approximately 32,000 cyclists pedal their way through all five boroughs on a traffic-free, 40-mile course. As its name suggests, the event is a tour, not a race—so participants can relax and enjoy one of the best ways to see the City. Registration is closed (it's a sellout), but you can still join and ride by committing to raise money for one of the tour's charity partners. And, of course, you can always enjoy the action as a spectator; check the official tour map [PDF] for details. And visit bikenewyork.org for more information.