L.K.
I did this for my son's 4th birthday also. Some of the games that we played were bobbing for apples, musical chairs, dropping a clothes pin in a bottle (this one you have the child kneel on a backwards facing chair and try to drop the clothes pin into the bottle with out reaching too far down), we also tied mini powered donuts to a string and tied the the string to an outdoor table and the kids had to eat the donut off the string without using there hands (very fun to watch and very fun for the kids), and we also had the usual-pin the tail on the donkey. I hope these ideas help you.