New Yorkers have a dirty little secret. They might like to present themselves as urbane creatures who spend their lives taxi-ing from office to bar to velvet-roped club, but in reality as soon as it's cool enough to venture out of the air-conditioning they are as keen as mustard for some good clean fun in the great outdoors... and if it involves swapping their suits for Speedos, so much the better. Whether we're talking an escape upstate or a white-knuckle ride on the Hudson there's plenty of good times to be had messing about on boats this fall. Below is my guide to the best aquatic thrills the Big Apple can offer.