Leave historical or cultural artifacts as you find them. It's the law. Signs are expensive. Please don't use them to sight firearms. Many people visit the CPNM for the scenery and quiet they find there.
Stoves are the best option.
Campfires, fire rings and wood collection can scar the CPNM's beauty. If you must build a fire, use an established fire ring. Bring your own wood with you. Do not burn plastics, glass or cans. Haul your trash out with you.