Hi, 

Thank you for your question! You and your wife can obtain a Senior Pass, and there is more information about how to obtain one at this link: https://store.usgs.gov/senior-pass There are also discounts available to disabled veterans and currently serving U.S. military families, and you can find out more about that here:  https://www.nps.gov/planyourvisit/passes.htm#CP_JUMP_5088576 

Otherwise, there aren’t many discounts. However, do keep in mind most National Parks in the U.S. are free! Only 118 out of 417 National Parks have an entrance fee. 

Best,

Sarah