One of the greatest joys I remember as a child was running through the sprinklers. Whether it was one of the cool fancy sprinklers actually designed for children to play in, or just plain old yard sprinklers; I loved it.
As an adult, I don't have much time for running in sprinklers anymore, but the other night one of my favorite little guys was taking advantage of the watering time in his backyard (this is California people, it's limited) and asked me to run in the sprinklers with him.