This is, by far, my most favorite gem of Chattanooga. Basically located in my backyard, this outdoor playground is full of trails. You have to go there even if you aren't up for hiking, because the views are endless along the road around the reservoir.
Rock City sits on top of Lookout Mountain and offers a really festive winter experience. A great excuse to go see the famous city on the mountain during your time in Chattanooga. Lookout Mountain also offers other fun attractions like Ruby Falls, the Incline, and Sunset Rock.