Lemon Grass in Maryville has great Thai and Sushi. It is near the Target, Chicago Uno:
From Knoxville
Take Alcoa Hwy 129 South. In Alcoa, exit to Right -Fontana, Atlanta- on hwy 411S /129S (just past airport).
At the 4th stop light turn LEFT on Lamar Alexander Pkwy.
It will be at the next stop light on the Right
I also strongly recommend Foothills Milling Company restaurant It moved from Weirs valley to Maryville. I don't have good directions to it but it is on the main drag near the hospital (Hall Rd). Fairly gourmet food, probably only evenings and you should get a reservation.