Ober Gatlinburg is for non-skiers as well as skiers. There are other things to do, as I previously indicated.
It can be reached by road, driving up the mountain from stop light number 10 in Gatlinburg, but this is not recommended because the parking is extremely limited! It can also be reached by an alpine cable car, which is the recommended way to go. At the bottom of the mountain there is a large parking lot a couple of blocks from the cable car. The cost of the cable car ride is about $9 per adult. There are discount coupons in many tourist attraction books, which can be found at most restaurants.
The main reason my wife and I go to Ober Gatlinburg is for the cable car ride (for my wife) and to eat in the restaurant with a view of the ski slopes (for me).