Anheiser-Busch in St. Louis was fun. Horse stables were immaculate. Beautiful grounds. Hubby enjoyed the beverage at the end of the tour.
Toured Frito-Lay in Dallas area in college. Even at that age, I was amazed by the spraying of cheese on the Cheetos.
Non-food, my favorite tour is the Longaberger Basket factory in Dresden, Ohio.