I hiked the full loop from the base yesterday. Cedar Ridge trail up to Brinegar cabin then across the park on the Bluff Mountain trail before coming back down the mountain on Flat Rock Ridge. Please do not attempt the full loop unless you are in very good physical condition. It was 17.4 miles total, and I think this time of year (late March) is a great time for it as the lack of foliage means that the entire length of the trail has gorgeous views. This is one of my favorite places.