Other forms: campers
Anyone who regularly hikes into the woods, pitches a tent, and spends the night under the stars, snuggled into a sleeping bag, is a camper.
People who go camping are campers, whether they sleep under the stars, in a cabin, or in a fancy Winnebago. And if you do have a recreational vehicle, you can say you're a camper who sleeps in your camper! The common colloquial phrase happy camper was coined in the 1980s: when you're a happy camper, you're as content as a kid who's having a blast at summer camp, paddling canoes on the lake and eating s'mores by the fire.