Mayor Bloomberg gives the city a reason to wake up early on Saturday morning: a 6.9-mile car-free route from Central Park to the Brooklyn Bridge. The route is accessible by the Lexington Avenue line (4, 5, and 6 trains) and runs down the middle of Manhattan. While it's perfect for bikers (if you don't have your own, the city provides rentals), there's plenty going on for the non-gearheads among us, including live music, arts and crafts, free workouts courtesy of Crunch, and the sheer novelty of seeing the city without automobiles. Could this be the beginning of a green future for our badly congested borough? Well, it is for at least a few Saturdays this month.