Can you camp in your car at this location? Just for a night

No. You can camp at Fort Pickens which is only a few miles East. It does cost but it is well worth it as they do have security patrols. It is also in a National Seashore Park.

You will get ran off. There is a very active police presence.

I think you actually have to be in a camper or tent.

I dont think so. But not 100% sure.. the sheriff's office is right next door to it. It seems safe. Just dont know the law