Games For The Pool

I'm planning on throwing a pool party sometime around the beginning of July and wanted to get some ideas as far as playing games in the pool. All I could come up with is playing with a big ole' beach ball, playing hot potato that splashes water when someone holds it and time goes off, that game where girls get on the guys' shoulders and try to knock the other one off and thats it. A

Any other ideas?

depend on the pool size. you can create a massive obstical course with giant inflatables.

giant inflatable races/noodle races

marco polo - but maybe if drinks are invovled prob not a smart idea.