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1. Scale a faux rock face at Brooklyn Boulders climbing gym, where you can take classes or tackle the 22,000 square feet of walls -- from beginner-friendly routes to advanced overhangs -- on your own ($25 for a one-day pass, brooklynboulders.com). To get a grip in Manhattan, head to the multichallenge wall at the Sports Center at Chelsea Piers ($50 for a one-day pass, chelseapiers.com).
2. Dip your paddle in the Hudson River at one of the free kayaking locations in Manhattan -- Pier 40, Pier 96, or at West 72nd Street -- with walk-up excursions on evenings and weekends (downtownboathouse.org). Or head to Brooklyn for a row on the East River, at either Brooklyn Bridge Park (bbpboathouse.org) or Red Hook (redhookboaters.org).
3. Rollerblade in Central Park with Central Park Skate Patrol, which gives group lessons in skating backward and "swizzles" and free weekend lessons in stopping ($25 per group lesson, skatepatrol.org). Once you've honed your moves, roller-boogie with the Central Park Dance Skaters Association at the Skater Circle on weekends from 2:45 p.m. to 6:45 p.m. (Free, cpdsa.org).