what games can i play in the water?
i don't know how big your pool is or if you have a diving board, so some of these ideas may or may not work for your party.
purchase several pool rings or toys that have weights in them and sink to the bottom of the pool. get 5 or more per team. each team should have their own color. throw them all in the pool and on your go one member from each team can jump in and retrieve one of their team's rings. if they bring up the correct color, the next member of their team can jump in for a ring. 