Sunday is a tough day to do distillery visits. Most are probably closed for summer shutdown and probably don't do full tours, if they do Sunday tours at all. I would suggest checking out the websites at Buffalo Trace, Woodford, Wild Turkey and Four Roses to see if they do Sunday tours. If so anyone of them would be worth visiting. You might want to come on over to Louisville and check out some of the bourbon bars. I highly recommend the Bourbon's Bistro and they are open for dinner on Sundays.
If you can't do bourbon tours, the Kentucky Horse Park is something else to check out. Well worth your time. If you come on in to Louisville, Churchill Downs is always a good tour, as well as the Slugger Museum (just look for the big bat on Main Street) and the Ali Center and Frazier History Museum.
"Our people live almost exclusively on whiskey" - E H Taylor, Jr. 25 April 1873