Red Rock is UNLOADED carry, but open carry is legal there. It's a Natl Conservation Area, run by the BLM. Reports are that they are very polite about enforcement and asking if your firearm is unloaded.
Do they define what "unloaded" means? Is it no round in the chamber and no loaded mag seated in the weapon, or is it no round in the chamber but a loaded mag seated in the weapon is ok?
They do define it. No rounds in the firearm at all. You can have a loaded mag but not in the pistol. Also no carry in the visitor center even unloaded. The PDF of the rules is posted someplace in the forum just do a search for it and it should pop up.
... Also no carry in the visitor center even unloaded. ...