Slip N Slide
Purchase a large painters tarp at your local Home Improvement store and let the kids go wild on the slip-n-slide. The best part is that the tarp is re-usable. Either set something heavy on the top corners or hold it down with some stakes. We made a 2 headed sprinkler with pvc pipe and place it along side the tarp to keep it wet. A helpful tip to keep kids sliding faster and farther is to squirt some dish soap on the tarp every so often. You can also have the kids wear a garbage sack to slide a little easier.