Water slides don't have to involve long lines, crying kids, and suspiciously warm water. There are plenty of natural water slides scattered throughout the country that offer relaxation and exhilaration, not to mention a view and a campsite.
Slide Rock State Park
Slide Rock State Park is named for a slick section of Oak Creek Canyon just outside Flagstaff, Arizona. Jimmy Stewart, Charles Bronson, and John Wayne all filmed westerns here and the place definitely looks like something out of a movie. The steep, tree-rimmed canyon walls give way to level stretches of sandstone perfect for catching some rays when you're ready to dry off. The park can get extremely busy during the summer, meaning there may be a long wait for a spot in the parking lot. Get there early if you can, and enjoy some of Slide Rock's sights until you're ready to cool off in the creek.
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