Found this information and not sure if some people are aware of this program. This is a discount card for National Parks and Federal Recreational Lands of up to 50% off your stays at federal campgrounds for seniors and permanent disability people. Lake Raytown, Hammond Lakes in Tioga would be some federal parks that would except this card. Here is the link you can check it out http://store.usgs.gov/pass/index.html

If permanently disabled the card is free. You just have to show proof of disability. I took my Social Security award letter to the Portage Railroad facility and got my card for free.