T.M.
Splash balls are a lot of fun :) If you don't have a pool you can fill buckets of water and they can soak them. Sidewalk chalk, bubbles, jump ropes, jacks...bikes, roller blades... i am trying to think of everything my kids pull out of the garage...lol!
Also sending out a picnic lunch with some crayons and coloring books.... set up a big blanket... it will buy you some time...lol!