The limbo is a favorite game for many kids. If you have the room a Hawaiian themed pinata is always fun. Have a mini hula dance contest with grass skirts made from plastic bags. Simple things like dropping rings on bottles is always fun for any age group. Water balloon tosses... Have little prizes available for the winners, leis perhaps? The child with the most leis at the end of games wins the big prize.
You can do balloon fights or toss,eat,jump rope,swinging on swings,go down slide,and jump off diving board