Nothing! Well, you should bring your phone, car keys and mask, but other than that, try not to bring anything else. When they take you inside, they ask you to empty your pockets so they can scan you with a metal detector.
They have strict rules about what you can’t bring inside, including strollers, backpacks, large bags, food, drinks, weapons and cameras (any DSLR cameras, even professionals). The last big one is the one that people miss, and we saw more people running back to their car to remove their cameras. The coat check is for coats only and is worth nothing.