I just turned 62 and bought my America The Beautiful Senior Pass, The National Parks and Federal Recreational Lands Pass. It is still currently $10, but will be going up to $80 on August 28, 2017.
What does the Senior Pass provide?
The annual and lifetime Senior Passes provide access to more than 2,000 recreation sites managed by six Federal agencies.
· National Park Service
· U.S. Fish & Wildlife Service
· Bureau of Land Management
· Bureau of Reclamation
· U.S. Forest Service
· U.S. Army Corps of Engineers
The passes cover entrance and standard amenity (day use) recreation fees and provide discounts on some expanded amenity recreation fees.
Travelling companions can also enter for free. The Senior Passes admit pass owner/s and passengers in a noncommercial vehicle at per-vehicle fee areas and pass owner + three adults, not to exceed four adults, where per-person fees are charged. (Children under 16 are always admitted free.). Also, at many sites, the Senior Passes provide the pass owner (only) a discount on Expanded Amenity Fees (such as camping, swimming, boat launching, and guided tours).
Lots of information here, including where to purchase... https://store.usgs.gov/faq#Senior-Pass
Half price at U.S. Army Corps of Engineers Campgrounds.....