9. Ohiopyle, PA:
Water parks are fun and all, but it's Mother Nature who makes the best waterslides. For evidence, depart from Pittsburgh and motor down to Ohiopyle
. At the Meadow Run section of the local waterway, a quick-running little current propels swimmers downstream into a swimming hole below. After checking in with the park to ensure the water levels are swimmer-friendly, dive in for a ride and, when you get tired, make like a turtle and sun yourself on the adjacent rocks.
Photo courtesy of Jon Dawson/Flickr