Don't venture into the smoky forests of Tennessee without a National Geographic Trails Illustrated Series Map. National Geographic pulled out all the stops when designing this series of maps; they include much more than trail markings and topo lines. In addition to trails, campgrounds, river crossings, and points of interest, these waterproof and tear-resistant maps provide info on wilderness travel, safety, and local flora and fauna. Includes UTM grids for use with your GPS unit.
These maps are pretty high quality. When I lived in the GSMNP region I used these for backpacking trips in the park. Trails and other features are well illustrated. Never had to test the waterproofing on these maps, but they are durable. Definitely recommend for your trip.