J.R.
1. Pinata's are great. Do 2 one for the younger group and 1 for the older group. Buy white lunch bags and setup decorating tables with stickers, markers, crayons, glitter ect. Let them decorate their own goody bags before they do the pinata. Thats always fun.
2)Gift certs to friendly's or McDonalds are good too.
Number 1 is my favorite. It works everytime for my 3 boys.