Question: things to do with water?
Answer: Play monkey in the middle with a water balloon.
Duck, Duck, Fish!* ... 
Have a jump rope contest … in the sprinkler!
Create a water park! ... 
Batter Splatter! ... 
Have your kids wash your cars*!!!
Play water-net sports! ... 
If you have a pool, host your own Pool Olympics and compete in: diving, freestyle, relay, etc…