On the drive in and out to Sage Creek, I saw all the major mammals of the park (bison, prairie dogs, deer, bighorn sheep, pronghorn), and there was even two bison grazing at the equestrian site in the morning. 

The campground is nice and dark and had a great view of the Milky Way. There is no water at camp, which was made very clear on the park website and map. Sage Creek did have some water flow when I went, so I could have filtered some if I needed more. 

My main criticism is that only a handful of the sites had shades for the picnic tables. When I arrived, the campground was less than half full, but none of the remaining sites had a shade. For a park that gets this hot and doesn't really have trees or other shade, I think this should be provided at each site.