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I need to set up a couple of games and I have no idea what games can be played with about 12 teens in a pool, help!

Marco Polo

i like the game marco polo. one person(the person who is it) is marco. he must call marco aloud. the other people(polo's) must respond with polo. if they are under water they are exempt from responding polo. but they can not cheat. marco must tag a polo inorder to end the round. i also enjoy categories, the person who is it goes to the other end of a pool. they choose a category. the other players are on the other side of the pool. the other people must choose a word that is in the category. the person who is it yells words in the category. it is the object of the game to swim, once your item int he category is called, to the other side without being detected or tagged

theres a game called chicken. it when someone gets on another persons shoulder and teams fight against each other to see who can stay up the longest