In case you're not aware of it's existence the Federal Government offers a lifetime Senior Pass to anyone 62 and older that grants free or reduced fee entrances into National Parks and Monuments. Currently the price is $10. However, the price is slated to increase to $80 for the lifetime pass, or $20 for a one year pass. The $20 will be credited toward the cost of the lifetime pass if you buy it later. The date for the change has not been set.

If you are now 62 or older and don't have the pass, and plan to visit a National Park, act now and get one. You'll pay for it many times over. If you reach 62 while the price is still $10, don't delay getting one.

You can get more info here: http://travel.aarp.org/articles-tips...-increase.html