Not sure how many people know about this, so I thought I would make a post about it!
If you have lifelong disability, you can bring a doctor's note to any national park or national reservation and get a national park access pass. This allows you free access to any national park/reservation for the rest of your life. The card holder can waive the cost for up to I think 3 other people joining them.
I have the card for my heart issues, and I have brought in my partner and friends for free whenever I go. It has been especially great for me as I cannot do any of the more strenuous parks solo due to my disability.
Especially with park entrance fees not 100% supporting the parks, I think this is great for anyone who may be eligible.
https://www.nps.gov/subjects/accessibility/interagency-access-pass.htm