Most of you have probably played Marco Polo at one time or another, but here's a quick run down of the rules which is basically a pool version of blind man's bluff and tag:

Get three players or more . . . three should be the very least you should play with.

Everyone get into the pool (pools should be safe for the ages and swimming skills of the participants . . . kids who can't swim shouldn't play this kind of game in pools too deep for them).  Decide who will be "Marco" or "It".

"Marco" goes to the side of the pool and covers their eyes and counts to ten while the other players move as quietly as they can to different areas of the pool.  When "Marco" stops counting they keep their eyes closed but try to locate someone else in the pool.  The players can move away from "Marco" to avoid being tagged, but of course they all should try to make the least amount of noise possible to avoid being detected.

When "Marco" wants a clue as to everyone's positions, they yell out "MARCO!" to which all the other players must respond by yelling "POLO!"  This will help "Marco" to find another player to tag.  Once another player is tagged they then become "Marco" and the game starts again.

Another variation is when someone leaves the pool, they must still answer when "Marco" yells out "MARCO!" and if "Marco" suspects that someone is out of the pool they can yell "FISH OUT OF WATER!" and open their eyes.  Anyone outside the pool at that point is out of the game.

You can also play by making rules such as everyone must have at least a part of their body in the water at all times.  Variations on the game are limited only to your imagination.

Have fun, be safe and Party On!