You'll want to do what you've done at home during your training. As
@opusone said, nothing new for the race. That said, I do recommend a gradual build up of carbs & hydration in the 4-5 days leading up to the race. I find this works better than a huge carb loading meal the night before the race. I will have a big pancake breakfast on Saturday (my coach always says to eat as many as I want), a light lunch if I eat one at all, and a simple meal of miso, sashimi, and steamed rice for dinner. My normal pre-long run meal during training is pizza and champagne or wine, but sashimi is my race tradition.