When I saw this idea at Teach Preschool at http://www.teachpreschool.org/2014/06/pool-noodle-water-hose-play/ for a pool noodle sprinkler I knew we had to try it.
It was so simple to make and the kids really had fun with it. All we did was poke some holes in a pool noodle. At one end of the pool noodle we shoved a bottle cap from a plastic water bottle in to close it off. That's it, attach the hose and you're ready to go.
I love that the water didn't shoot up that high so it was great for the little ones. Therefore you could just cool off a little bit but you could play with the whole hose and get real wet if you wanted to.
I give this activity five stars - cheap, fun, quick and good for a large age span.