This would get used non-stop at our house, just don't know where it could go.
Human car wash!
How To Make A Foam Pool Noodle Sprinkler DIY Project | http://thehomesteadsurvival.com/foam-pool-noodle-sprinkler-diy-project/
DIY Water Wall
Sidewalk Chalk games and activities - 30 things to do with sidewalk chalk. There are so many great ways to get outside and LEARN using sidewalk chalk.
Water balloons half frozen with candles placed in the hollow center
Water Balloon Pinata
Water Pinata! Hmmm..so you bash at these with a stick? Kids would love it.
* * * * *100 Things To Do With Your Kids This Summer! Now, we haven't done all of these things however, we have done quit a bit and it has been a hit! The summer isn't over yet so there are many more that we will be doing. Check out this list.