The idea is cool. I imagine actually trying this in Florida, and digging it would include many breaks to go cool off in the water... & then there's the no bounce rule obvs. And the rinse cup would get sandy fast. But hey- I like the idea lol.
Giant Beer Pong | Traditional beer pong, only with trash cans (or buckets) replacing the cups and volley balls (or cheap rubber balls from the toy section of Walmart or Target) replacing the ping pong balls.
Outdoor games to play in SUMMER-keep those kids active