For anyone who will be near the Kentucky Horse Park, there are tons of very entertaining farm tours in the vicinity. They have a wide variety of options, including some of the very top thoroughbred breeding operations, plus OTTB adoption centers, sport horse farms, vet clinics, Keeneland race course, etc., etc.
Prices start at $15-$20, and most of the tours last from 1 to 2 hours. I believe there are several different companies that organize tours, and I’ve had very good luck with this one.