Grab some blankets and attempt to pull your partner across the lawn as fast as you possibly can. Obviously things will be a lot easier if your partner is under 4 feet tall!Full instructions at Sweet Dreams Are Made Of These.
Balloon Stomp - 1 blown up balloon per guest, plus few extras ties w/ lengths string (curling ribbon or yarn etc) Tie to 1 ankle each child. Children run around trying to "stomp" (pop) everyone else's while keeping theirs intact! Last Intact balloon wins!