3. Mighty Mud Mania

The Buzz -- A Scottsdale tradition for over 30 years, this sloppy summertime spree provides 120 tons of mud for under-18s to wallow in. A mud obstacle course, complete with tunnels, a cargo net, and plenty of puddles, offers a mucky challenge that kids love. A power hose at the course's end undoes most of the damage, but the town of Mudville is equally dirty and right next door. Swimming at the Chaparral Aquatics Center is part of the fun, but come early – around 10,000 kids participate.