Another tip from Disney Family Fun magazine. For their long car trip, this creative mom made vouchers and gave them to her kids for good behavior! She cut beach shapes out of construction paper and wrote the special treat on each such as:
1) At the next gas station you get to pick out a treat
2) $5 cash
3) Radio Control for an hour
4) A new beach toy for you
You get the idea...the possibilites are endless!