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The largest art installation to hit New York since Christo and Jeanne-Claude’s Gates will be Olafur Eliasson’s New York City Waterfalls. The four man-made structures, ranging in height from 90 to 120 feet along the East River, will drop thousands of gallons of river water a minute — and the faucets get turned on Thursday at 7 am and run till 10 pm, when the falls will be lit by LEDs. For a good view, stroll the Brooklyn Heights Promenade or Empire-Fulton Ferry State Park, hop on the NY Water Taxi from Fulton Landing to South Street Seaport, or try the new, free Ikea shuttle. June 26-October 13 at Governors Island, Piers 4 and 5 in Brooklyn, under the Brooklyn Bridge and Pier 35 in Manhattan, nycwaterfalls.org