Piney Branch / LDS loop is a great hike. Sheer cliffs, lots of water.
My cousin and I started at mile marker 21 off Skyline drive and worked our way over to little devils stairs, our favorite part of the hike. However, we continued onward flanking Pignut, Fork and Three sisters mountains to the north then making a turn for north and headed up towards the matthews arm campground. The total milage was 16.8. Little Devils stairs is great though!