For Adults 'Pool-Polo' even with a long pce of rope across the pool sideways, and a ball.A bucket at each end.
Kids love the blow-up beds, and they can play ''pirates'' on them.
Swimming comps, and a treat after for the winners...same for adults.
My favourite, throw something that will go to the bottom of the pool, and see who can get it with (eyes) shut!
If you have a dog...who is allowed in the pool, then that makes for throwing balls for the dog, and see if the kids can beat the dog.
Blow up some balloons and see who can get them as they bounce on the top of the water.
And the old favourite is dog padding from one side to the other, and yes...if you have a dog, he has to be in the race!
Have fun :)