Warning: do not go here if you are used to so called 'beer' from some large international brewery - you'll end up drunk swimming through the Amsterdam channels if you go without a buddy to protect you.
This brewery is well known by lovers of a good beer and on sunny days you'll have to stand in line to get your beer and can forget about a place to sit (so you'll sit on the pavement).
For small groups there (less than 20 persons) and individuals there is a free tour on friday afternoons at 16:00 (reservation not required).
Take your camera because the place is located at the foot of a big windmill.