Cover and disguise the cathole. Don't leave toilet paper on the ground. If you alter an area in any way, restore its natural appearance before leaving. 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.