A trail run is essential a hike, which is essentially a walk in the park, right? If you go into Frozen Trail Runfest with this attitude, you may find yourself sorely surprised. The event, which includes a 5k, 15k, 25k and 50k, will be the final event in the Run Big Trail Series. Held at Buford Park at Mount Pisgah, each distance combines loops of varying sizes, but all start and end at the horse…