This 100 is an out-and-back from Cloudland Canyon State Park up to Chattanooga and back. You even get to descend (and climb) over 1,000 steps down into the canyon and see a couple waterfalls along the way. After pretty tough weather conditions in 2018, they are moving the race to a different time of the year in hopes of better weather and less than 14.5 hours of darkness overnight.