When we visited Yellowstone, we also went to the Grand Teton National Park, and I found it more beautiful than I could have imagined.
We stood at the same point that Ansel Adams took his famous photograph, overlooking the winding Snake River, and I did a pencil and watercolour sketch.
The wildfires in nearby Montana were making the skies a strange smoky texture, and many of the views we had were softened and mysterious.
We went on an early morning river rafting trip and I managed to paint a few quick sketches of the passing scenery and sunrise. 
We saw elk, moose, bald eagles and even two baby bears.
It was a truly inspiring place; a smaller but perfect National Park. I loved it.