I'd plan ahead for a taxi unless you have some time to spare. Uber/Lyft may be an option too. The airport is in Sevierville, TN; at least 45 mins to G-burg this time of year unless you hit absolutely zero traffic.
If you are coming in from the southeast and fly down Wear's Valley (the one that you can barely tell is a valley - SE from TYS) it tends to get bumpy, particularly in the afternoon. If that's the case, just hop over the ridge to the north to the flats and it usually smooths out. If you land on 28, it's easy to end up high on final due to the hill on that end; although they've done a lot to lessen it over the last few years. If the wind is kicking from the southwest or south and you are landing 28, be aware that you'll lose all that wind at about 30' due to the big stand of trees on the south side of the approach end. Couple that with being high and likely having the power back and many people have been surprised by that over the years. Honestly not a big deal, but just something to be prepared for.
If you are showing up on a Fri/Sat/Sun afternoon in the summer or fall, triple all commute times anywhere in the area.