As a change from running a Treasure Hunt - here is a great childrens game. Follow the links for other party games to entertain your kids:

Balloon Ball

Divide your guests into two teams and have them sit on chairs in a line facing each other. It may be a good idea to have all shoes removed.

Each team needs a goal minder who stands behind his rival team. The balloon is thrown to one line by the hostess. The idea is that the teams will score by kicking or knocking with their hands the balloon to their goal minder to catch.

Players should not be allowed to rise from their seats

A burst balloon can be counted as a goal for the other side. Have plenty of spare balloons available.