You should eat what you normally eat leading up to long training runs (assuming it's nutritious, high-carb food that you like). Right before a marathon is no time to try something new.

Also, good luck!

The day prior to the marathon i am really careful about hydration. I drink a lot of water BUT also a lot of gatorade the day before. I think in Hal Higdon's book he recommends eating something right before bed like a protein bar that has carbs + protein in it and then eating when you first wake up.

I like to have a plain bagel (as in nothing on it) to nibble before the start of the race.

All good advice here...me I do not change much, just am sure to drink water AND juice or gatorade, not water only, its the only time besides during a run that I drink anything with calories in it....
also I do not 'carbo load' or eat a HUGE pasta dinner, I do eat pasta but 'normal' servings...and snack as always.