Have you looked on the NPS website for information on SMNP? Trails vary from easy and short to strenuous and long. Lots of water falls to go see. You could try calling the Sugarlands visitor center to see what they could help you out with. Clingmans Dome is worth the trip up the trail. Cades Cove is a great place to have a picnic. There are a few buildings and cabins you can go through too. You may even see lots of wildlife, from deer to maybe a bear while there. If you would like to see some elk then go over to the Cherokee side to The Oconaluftee visitor center. They have a small village to go through and the herd usually hangs around there. There is a grist mill just before you get to the visitor center too, go see it.
While in the area you might want to check out Forbiden Caverns. If you do then after you could do a lunch at the Bush Bean Factory Café not far up the road from the cave. Nice little museum attached to it too worth going through.
Dollywood will be open if you want to visit there.