If you do plan a few days in Gatlinburg, I'd like to suggest Twin Creeks RV Park. We have stayed there--nice quiet park, pretty creeks, pool, FHU, and the Trolley makes a stop there. I used the trolley to go downtown to visit all the neat little shops--I think it was maybe $1...saves looking for parking places. The trolley also goes to several other areas--like Dollywood, and the Arts & Craft area. You can check out the Gatlinburg Trolley online and it will give their scheduled stops.
If you are interested, there are several waterfalls around the town of Cherokee.