I've taken 441 with my class C. It's a pretty road but none to fast and certainly not as easy going as the interstate. There are pleny of noticeable grades and pretty sharp curves and so forth. Ken's route is also what I would suggest, but it looks like the proper exit number is 440 according to my map.
I thoroughly enjoyed my visit to Dollywood; it's one of the nicest amusement parks I've been to. They have quit a broad range of attractions, many of which appeal to people other than adrenaline junkies. Wear good comfortable walking shoes.