Been there a few years ago. Bison go where Bison want to go, which is sometimes where people want to go also. The area around Old Faithful and the other geysers has a walkway which winds around several acres. It is also where numerous bison hang out. I had a young one approach to within 15 ft while he calmly browsed on the grasses.
The spirit of our day is a soft acceptance of everything—except deep conviction in anything.