A few years ago out in Boulder, Colorado I met one of the assistant brewers of one of the smaller breweries there. In the process of sampling a few beers with him I found out that they would be looking for another assistant brewer soon. As I was somewhat interested in applying I asked if I could get a tour of the place, not telling him that I was thinking of applying. When I showed up at the brewery the next day he apologized and said he really didn't have time to do a tour since they had an unexpected deadline to get a bunch of beer packaged. He then asked if I wanted to help on the bottling line and we could talk while working.
That couple of hours of volunteer work was quite informative. I found out the usual stuff, history, types of beers they make, general process, etc. In addition, and more important, the approach the head brewer had to brewing, water treatment, yeast handling, recipe development and such. Also I learned from the other brewers what it was like to work for the guy.
Basically, I interviewed the brewery and determined that I did not want to work for them even though the other brewers encouraged me to apply for the job. Doing this type of research on the workplace can be just as important as how you handle yourself when they interview you. There is an old saying, "Be careful of what you wish for..."