Highland Creek Trail is the longest and most diverse trail in the park. The Rankin Ridge Trail climbs to the fire tower lookout at the highest point in the park. In the early 1900s, bison, pronghorn, and elk were brought back to the park to live on the preserved prairie habitat. Today these animals flourish to the point where there are yearly roundups after which animals are transplanted to other parks in other parts of the country. If you are venturing into the backcountry on your own, keep an eye out.
Bison are unpredictable and surly.
Steer clear of them. Also beware of rattlesnakes, ticks, and deerflies. If you don't want to tackle this minefield on your own, organized animal peeping visits like a prairie hike are offered through the visitor center. Cruise the Prairie Roads Three strips of well-maintained road open up the park to wheeling spectators. Backcountry biking is forbidden.