Hydrate before, during, and after. Not just water but something with electrolites. I like Acclerade because it has a little bit of protein too. (warning: it tastes nasty)
Be very good about eating the next couple days. Don't over eat, but be sure to eat good healthy food. Think fuel not flavor. The amount of pasta required to "carb load" is alot less than most people think. It really is quality not quantity that counts.
Start slow at the race. REALLY slow. You'll be surprised at how fast you are going even when you think you are going really slow. Races do that.
Good Luck! I can't wait to hear how it went so be sure to post on the race reports thread.
Cecilia