Heaven Hill is big, many different brands come from this place. Elijah Craig, Evan Williams are just a couple of their brands. I think they are the second largest of the distilleries. It is either Parker and Craig Beam are the master distillers there.
If you are a Makers drinker, they have a good tour as well. Even though it is owned or was owned by Jim Beam (now Suntory out of Japan) they have kept the place fairly old school and it also has a lot of history.
I like the bourbon and the tasting room from Heaven Hill, but I would probably say that the Makers Mark tour is better. The actual Jim Beam distillery in my opinion was my least favorite of any if you had considered it.
I also would not try to do more than two tours in a full day, to appreciate the places you need to take your time. So if you are on a short day, only try to hit one. You are not going to get to drink that much bourbon so that is not an issue.