I never had a campfire there because at this time of year the heat, humidity and mosquitoes are so oppressive. I haven't been to Camp Hatteras (or the Outer Banks) in quite a while, but when I camped there, many, if not all of the sites had a charcoal grill if you wanted to cook outdoors.
Unfortunately, the recent visit from Hurricane Arthur impacted the operation of some of the attractions, including one of my favorites- the Chicamacomico Life-Saving Station
. It's only about a mile-and-a-half north from Camp Hatteras on NC-12.
You'll have to check first to see if they're back in operation, but If you go there on a Thursday, they do a "Beach Apparatus Drill" where they do a reenactment of a rescue using a breeches buoy. Children will find this especially interesting. See their website, though, for current information as to if and when they'll be open again. This demonstration is very popular and they recommend that you be there by 1:30 PM. However, I recommend even earlier as the parking lot can fill up quickly; especially if the weather is good.