The Interagency Pass cost $80 and is good for one year from date of purchase.

What is it? Entrance Pass to National Park Service sites that charge entrance fees.

Who is it for? General public. Anyone may purchase. The pass admits the pass holder and passengers in a non-commercial vehicle at per vehicle fee areas and pass holder + 3 adults, not to exceed 4 adults, at per person fee areas (children under 16 are admitted free).

How to get one?  Go to http://store.usgs.gov/pass. or at most national parks.

To find out where the Interagency Annual Pass can be used go to recreation.gov.