Holsten Brauerei, now owned by Carlsberg, offers two-hour tours of the brewery, ending with a snack and freshly tapped Holsten Pilsener. There's a more comprehensive four-hour seminar for beer connoisseurs and an eight-hour "beer expert" seminar in which you brew your own beer and design your own beer label. The beer is delivered to you after maturation. Check times and register through the website.
Holsten-Brauerei, Holstenstraße, Hamburg, Germany