After sunset is usually the best time to find yourself a spot here and watch the golden light sweep through the valley as you search for signs of wildlife.
Lamar Valley is one of the best places in the park (and the world) to spot epic wildlife. Bears are frequently seen here, along with foxes, coyotes, and the park's elusive wolf packs.
Grand Prismatic is the largest hot spring in the United States (and in my opinion the most beautiful in the world) is a must add to your list of things to do in Yellowstone National Park.
Just watching raw power of this two-tiered waterfall as the Yellowstone River plunges first 108 feet at the Upper Falls and then an awe-inspiring 308 feet at the Lower Falls is something else.