There were over 60 letterboxes in a 10 mile radius of my campground near Knoxville! I hunted for almost half of them and found half of those! I discovered hidden parks and cemeteries, and visited historical sites I wouldn't have otherwise known about.
The weather was great and the leaves were colorful, so I know that the Great Smoky Mountains would be crowded. I have been there before, so I could forego that visit this time. I've been to Dollywood and other tourist hotspots, so my hobby was the perfect thing for me to do to get exercise, have fun, and see different places.