Another fun thing to collect from your National Park visits are hiking medallions. Most of the park visitor centers or gift shops have them. Some have several different kinds. There are general designs and also medallions for specific hikes.
I found a great light hiking stick in Bar Harbor, Maine when we visited Acadia, so I have been buying some medallions to put on it soon. I first saw the medallions in Yosemite, but I did not have a walking stick then.
Check out how people put medallions on their walking sticks on my Pinterest Hiking and Walking board.
Someday, I hope my walking stick will travel along with us in our Airstream!