Hunt the Prize
A treasure hunt activity
Hide some small prize or sweets in the party room (or better still if the weather is good, hide them in the garden)before the children arrive.
Whenever you decide during the party the children are allowed search the room or garden for the prize.
You can give them hints by telling anyone who is close that they are hot while someone who is looking in the wrong place is cold!
Whoever finds it keeps the prize.