For fans of darkness, nature, bicycles, the environment and ghosts, the good folk at Time's Up have organized another auto-free ride through Central Park to mark the first Friday of the month. Guides lead the way through a 10-mile leisurely stroll, er, roll. Lights not required, but by all means, bring 'em if you have 'em. Safety's cool! Meet at Columbus Circle, SW corner of Central Park & Broadway.