Drenched 5K, Philadelphia

There's no better way to cool down on a run than throwing some water on your face or, in the case of Drenched 5K, speeding through a misting tunnel, traversing a sprinkler minefield, navigating a foam zone, and zooming down a 100-foot slip 'n' slide. In cities across the country, participants of all fitness levels can hit the pavement during a soaking-wet sprint that culminates in an after-party with drinks, entertainment, and a huge water balloon fight inspired by Songkran, Thailand's soggy New Year's celebration. After the race, participants take home their race T-shirts and sunglasses. A portion of the proceeds goes toward local charities.