We stopped off at the Pawnee National Grassland. There is no doubt a lot to see if you know where to look. I do not, unfortunately.
The area just east of Denver is very intensely used by cattle operations. I have never seen anything like it in Virginia or Wisconsin. The smell was not pleasant, but I expect you get used to it.
Had a nice beer and pizza at “Tap & Dough” in a nice Denver neighborhood near Washington Park. Nearby is the the intersection of Tennessee Williams.
It looks like ash trees are the most common sort of street tree in Denver, which makes the emerald ash borer especially bad news. You can protect the ash trees but it is expensive. Some in Denver are taking steps to protect their trees.