I went with a couple buddies this past weekend (1/18-1/20) and had an absolute blast. We stayed in the south prong tent campsite (primitive but not hike in). Saturday we hiked the South Prong trailhead and cut across the Haynes Ridge cutout, and it was amazing. It’s a 7 mile loop with an elevation of around 3000 feet. It’s a good 3.5-4.5 hour hike, but the views are amazing. The other fun thing we saw were bison. They roam at this park so they warn you to give way. We only saw one, but it was incredible.