If your party is large (and especially if it includes older children or teens who might be "on their own" for parts of the day), make a "Where's Everyone?" board before you leave home. On a piece of cardboard, write out places that your family might frequent: Pool, Buffet, Sports Deck, Casino, Arcade . . . wherever your family might be found. Then write each person's name on a clothespin. When someone leaves the room, he should clip his pin on the spot he can be found.