Hiking to the top of Harney Peak was definitely a worthwhile experience. It was really impressive to see all of the climbers’ flags at the top (when a mountain climber summits a peak, they often leave a small flag).
Seeing buffalo in close proximity is the norm near where we stayed in Hot Springs, South Dakota. At one point, we stopped our car to let a herd cross the road and one came right up to the car to pass. They are HUGE, and apparently can be quite aggressive. With the exception of one instance where Aaron got a little too close for comfort (not smart!), we kept our distance and admired them from across grassy plains.