Used to play a game in the Ahlens' pool when we were kids. One person would be blind folded and yell out "Maaarrrrrco". Everyone else would answer "Pooooolo" and the blind person would have to try and tag someone. This could go on for hours.
New twist on the game - there is a Marco Polo reference in this picture form the docks in Split, Croatia. First person to email me (email@example.com) what that Marco Polo reference is gets a postcard from Ohrid, Macedonia.