We went to Woodford Reserve last summer, which was great. I'm not a huge bourbon guy, so that was enough for me, plus I was with the whole family. I recall that Jim Beam and Maker's Mark also get great reviews if you want to add another one, but doing all 8 wouldn't be much fun for me. There's also one other one that gets good reviews on TripAdvisor that's not part of the "official" trail (which just means that they pay money to be part of the program). You should also look at a map to see where they are, as I recall that 4 are clustered in one area and 4 in a second region, and some are much closer to the main highway than others.