Great fun for your kids this summer super cheap check out these ideas!

1. Water blob tutorial by Clumsy Crafter 
2. DIY kiddie car wash by Mom Endeavors
3. Soap boat races by I Heart Nap Time
4. PVC sprinkler water toy by Instuctables
5. Painting with water by Kids Activity Blog
6. Backyard sprinkler park by Event Horizons
7. DIY water wall by Tinker Lab
8. Homemade water slide by Parents Connect
9. Water themed birthday party by My LDS Projects
10. Water balloon piñata by Scrap Happy Heather

11. Make your own water table!  could be used as a sand table too!

I found the above ideas on Babycenter.com blog

Make your own Backyard Sprinkler Park

Bucket Dump

Flower shower

Dueling Noodles

The Tunnel
check out this awesome park ideas created by Chris @ http://eventhorizons.wordpress.com/2008/07/19/backyard-sprinkler-park/

PVC Sprikler idea by Sutton Grace
idea available at http://suttongrace.blogspot.com/2011/06/bring-on-heat.html