1. Open a fire hydrant Splashing around in a fire hydrant's cooling spray is one of those quintessential summer-in-NYC activities, but before you proceed, don't forget to get a free spray cap from a nearby fire station. Not only will the firefighters help you install the cap, you'll also avoid getting slapped with a $1,000 fine. No advance planning is necessary; simply show a form of ID proving you're over 18, and you'll be set with your outdoor shower for the rest of the day. (Just remember to bring it back to the firehouse once you've finished splashing around.)