Omg!!! You’re going to have so much fun! I’m jealous!
Now, to answer the question, I’m around the same age as you, and I actually love going to Gatlinburg and Occoe with my family. We like to go to
1) Ruby Falls,
2) the Aquarium (It’s huge! If it sounds boring, okay, pass it up, but it can actually be pretty cool if you’re into that kind of thing)
3) Go hiking in the smokies (we’ve seen bears up close! scary, but fun!) If you can time it to be on top of a ridge at sunset, you won’t be disappointed. it is a magnificent experience
4)You need to eat dinner at one of those restaurants with patios overlooking the river, too! The views are gorgeous!
5) There’s also Dollywood. I haven’t been there since I was a kid, so I’m not sure if I recommend it, but some of my friends had fun there last year.
6) Also, wandering around “downtown” near the Aquarium and the Imax is actually really fun. There are funky cafes, used bookstores, and that type of thing.