Any BLM land you can get to that is 1000 feet from any road or dwelling that isn't a campsite or other wised marked "no shooting" is fair game as well. You can get a BLM map at their offices. The one I know up is up by the Santa Fe casino. You can also take 95 north, turn left at the prison, and keep driving past it to a neat little spot with a tiny pond. Or call metro non-emergency @ 311 and just ask them.