I will be in Pigeon Forge for a few days - any recommendations on courses to play within 60 - 90 minutes drive?

Mills Park - 9 holes in Gatlinburg. Play the sidewalks OB to make it interesting.
Knoxville:
Victor Ashe - long and wide open.
Morning Side - mixed with 4 sets of tees. Play with a local to find your way around
Admiral Farragut - 9 hole pitch and putt with blue/red tees. High school hangout after 3.
Carl Yearwood - short wooded 9 holer with three sets of tees.

Try to make it to Warrior's Path and/or Fossil Hill too.

knoxville web site (http://www.knoxvillediscgolf.org/)

What days will you be there? Kingsport is just outside your 90 minute frame, but there are a few nice courses here.