Secret New York : curious activities

Shoot a rifle off Fifth Avenue, track the path of an underground river that flows beneath Washington Square, take a trip within yourself in a sensory deprivation chamber, learn to spot fossils in the walls of buildings or collect your own on city beaches, observe bats on the hunt during a night walk, listen to a Stradivarius in a tiny concert hall created by an obsessed luthier, explore forbidden islands in a kayak, prepare for the end of the world at a survival class in Central Park, speed through the bay on the rail of a racing sailboat, climb giant trees in a botanic garden, go on the beat with a pair of NYPD cops, take a puppet-making class from an expert, watch feeding whales lunge from the deep.