>>2841981
Why I use the National Park Passport Stamp Book, of course. I can slowly fill in my book with all the unique stamps at each park or NPS site that the friendly rangers give you. It's so fun! I like to see the awe and wonder in peoples faces in line at the front desk when they see me casually flipping through a nearly full stamp book. It's the only real way to prove you've been to these places, and it is the first thing I do at a new park. Sometimes, if I don't have the time, I just drive to the visitor center and get the stamp and leave!