If you are in LAS VEGAS, you must visited GRAN CANYON, it's increible! You can see it by plane or by car.
GRAND CANYON - allow 1 or 2 days, depending how much you want to see. (A great resource for this and other Vegas excursions, click on 'Travel' at www.lasvegas.com, go to the 'Day Trips' link.)
Once again , the breathtaking scenery on the way...and look, no potholes in the road (this is really strange for Canadians, our roads suck)