[kamocat]

I was thinking frisbees might be fun.
At any rate, I'm hoping for something we have to launch into the air.

EDIT:
We could be required to skip a frisbee-like gamepiece off water. Say each gamepeice has a name printed along the rim, and we have to skip each gamepiece accross the water a number of times before we can let it sink to the bottom of the pool. Points would be allocated for skipping the gamepieces, but most of the points would be in sinking the gamepiece at the appropriate time. The autonomous period at the beginning would be dredging the frisbees out of the bottom of the pool (the pool would only be a meter in depth).