Did you know that members of the U.S. military (Army, Navy, Air Force, Marines, Coast Guard, as well as Reserve and National Guard members) AND their dependents can receive an annual national park pass at no charge? And disabled vets can get a lifetime pass.
There is also a HIGHLY discounted Senior Pass available for $10 per year (usually $80) for folks 62 and over.
The passes can be acquired at any national park that charges an entrance fee, including our own Lake Mead National Recreation Area. Click here for more info on all the passes and some other stuff (fees & licenses, etc.).