Get busy making those reservations now. Thanksgiving is a very popular time for campgrounds. Allstays has a good list of cgs in and around Chattanooga.
Chattanooga campgrounds.There's plenty of things to do around Chattanooga, TN. I don't know what your hobbies are or your entertainment preferences are but we enjoyed
Rock City especially with friends and family. It's technically in Georgia but it's only 15 minutes SW of Chattanooga.
There are quite a few history sites we enjoyed and the Chattanooga Aquarium.
Here is a link for activities and things to see.
https://www.chattanoogafun.com/things-to-do/attractions/