What's a good way to reward kids for good grades?

While a good education is its own reward blah blah blah, a little syrup on top of your S’mores always makes the treat more treaty. My usual is a trip to McDonald’s. Mom and dad get some of their favorite foods. In the meantime, the little one could enjoy some nice white chicken, apple slices, and white milk that comes with a little toy that they love. The other bonus is, after the meal concludes, the kids could go and burn off their calories right there in the Play Place while mom and dad could get a few chapters in on their latest literary selection. Any other suggestions besides for some Mickey D’s under them Golden Arches?