A Few things we found were helpful last year on the infield:
SUNBLOCK - you'll be sorry if you don't
A small cooler with water and snacks - it's FLORIDA and it's hot. I pack a picnic lunch so I can spend more money in the vendor area, lol.
A couple of folding chairs - long day and sitting on the tailgate gets old - I'll bring a few as I understand the long haulers don't have lots of space.
Pop up sunshade tent (EZ-Up of the like) - If the sun's out, it gets roasty toasty out there, and there is not many spots to hide from it. ( 3 or 4 were brought last year and it was enough). - I have one I'm bringing.
Comfy shoes, you'll be walking....ALOT.
Camera, lot's of cool rods to take pics of.