What Do You Love About Yellowstone?

Hi , We love Yellowstone National Park, and I am presently working on the first draft of Ashes Over Yellowstone, a novel set in the park, with characters from our previous Hallowed Halls of Medicine series. I can almost feel the breezes, hear Old Faithful erupt, and see the mud pots, even hear the wolves howling and the bison growling. Have you been? What was your favorite experience?