This project owes a big debt to the original KidWash instructable by discontinuity. When I saw it I knew right away it was going on the "must build" list for summer. A great combination: simple project, lots of fun for the kids!
I headed down to the PVC section of the local home improvement store to pick up supplies. While browsing the adjacent sections for interesting stuff I noticed the micro-irrigation section and inspiration struck: KidWash with mister jets!
The modification worked great. We turned it on and kids from up and down the block started showing up to help with the testing. It's a lot of fun on foot, but my kids also get a blast out of riding their bikes through it (just like dad at the carwash).
See step-by-step instructions, along with more photos, at Instructables.
(Pictures courtesy of J. Good Photography)