GET A MUG SHOT
it's good for a year
-They have been working on this for several years now, and it's almost a standard practice. If you don't like showing your driver's license when you enter the park, get a pass with your picture on it.
-Information and policy, and procedures here:
http://nationalparkstraveler.typepad.com/
national_parks_traveler/2006/04/customize_that_.html
http://www.nps.gov/yell/home.htm
