You will be able to get meals in paddock or along midway. Drinks also.
Sun screen!!!! There is no shade! (not too bad at night
) You should go to Green Park, some interesting corners, hairpin and Turn 10, and interesting wildlife, so maybe moon shade
Either a folding chair or some sort of cushion type thing, heck, even just a plastic sheet, will give you some comfort on the viewing mounds. Look for ants before you become stationary. Take a good, hard look.
FM band radio to pick up Radio LeMans, which I agree is essential to enjoying the information about the race.
I am curious if you already have your hotel or accomodations locked down?
robber