The Smokies are my favorite place

and much cheaper than Disney in my opinion.
I actually planned a destination wedding there because I love it so much. I usually go there at least once a year and at one point in my life, I was going twice a year. If you can ever go in October for the fall colors it is beautiful! Last year we brought my 13 year old nephew and our kids in June. They had lot's of fun playing in the creeks (free). The water if freezing cold, but no one seems to mind that. The Greenbrier area is a favorite of mine to play in the creeks, but Townsend is also nice to stop and play in the creeks if you are headed to Cade's Cove. I love Cade's Cove. In Townsend there are places to tube as well. Some people get motion sickness from the winding roads. There are a lot of things that can cost you money, but we like exploring. Bring a cooler, and explore the park for at least a day. We loved hiking the Chimney Tops, but they have been working on the trail for well over a year now I believe (I don't think it's completed yet) and the Chimney's Trail is sometimes only open on certain days. The Alum Cave Bluffs is another trail we liked. One of our favorite waterfalls is near Cherokee, NC and called Mingo Falls (it is near a KOA campground, and I find there isn't much signage for it, and it's not as advertised as some of the other waterfalls).
My husband loves how small Dollywood is in comparison to Disney and all of the shaded areas because of the trees. I think we bought a 3 day pass, but if you are going for 3-4 days, I wouldn't waste them in Dollywood. There is also a waterpark, which we did on one day.
Some of my favorite restaurants are: Pancake Pantry (Gatlinburg), Bennett's BBQ (PF & Gatlinburg), The Best Italian (original location in Elks Plaza in Gatlinburg), The Cherokee Grill. A lot of people like the restaurants The Apple Barn & The Old Mill but they aren't my favorites. There is a place called Fanny Farkle that is near the Pancake pantry- I love to get the sausages they grill with onions, bell peppers and oregano. I like to ride the tram in Gatlinburg at Ober, and the Sky Lift is fun as well. I belong to the Great Smoky Mountains Association, and have a card that gives me a discount at Ober. The Ripley's Aquarium is nice for a rainy day but it is very expensive. There are many outlet malls, and also a lot of places to zip line at. We like to shop at the "Christmas Place" in Pigeon Forge and they have many Christmas ornaments that can be personalized...I love looking at all the Christmas decorations. I tend to try to do those things if it's a rainy day. There is an area called Cataloochee, that has Elk but it is a bit of a drive and kinda scary in my opinion. Clingman's Dome is a popular spot to drive and hike up an observation tow er. I read a lot on Trip Advisor in the early years of my travels to the Smokies. There are a ton of places to rent cabins and a ton of hotels. We often do the hotel because it's a lot cheaper and we don't usually cook on vacation. I like to get a hotel at the end of Pigeon Forge that is closest to Gatlinburg. There are two big Best Western's- we tend to stay at the one next to the Dixie Stampede. By staying at the end of the PF strip, you are located to plenty of restaurants still and not too far away from Gatlinburg. I like the Wears Valley RD and it is a shortcut kinda into Townsend/Cade's Cove. If you rent a cabin, it is a beautiful area. Our last cabin rental we decided to stay in Gatlinburg and we had a nightly visitor from a big bear.... and the roads in Gatlinburg were very steep. When you rent cabins you have to worry about the steep driveways/roads. I would also sign up on the groupon type websites and put Knoxville as a location because sometimes they will have deals for some of the amusement type places. If you go to Cade's Cove, stop at the campground store and get a ice cream (either in a cone or cup)...you will see everyone enjoying this treat. We also sometimes get the nachos.
In all the years i've gone, i've never been brave enough to do the rafting. We did a train ride in NC one year, that took us to an area, where the USA kayaking team has trials. I can't spell the river. Beware of all the timeshare people at gas stations, supermarkets, on the strip in Gatlinburg...they can easily waste away your time if you take them up on an offer.