A.S.
When I have done food at parties the kids don't eat much because they are having so much fun playing but they will drink a lot. So I agree the cake, ice cream, and a drink will be plenty. Then if you do a treat bag put maybe a second snack in that like goldfish, pretzels or chips for their car ride home they will have a snack to eat since that is when they will stop playing long enough to eat.