I've never done it but I have toured some breweries and know of a few people who have done the boat tour. Of the three on the tour, really Lakefront is the only worthwhile one. Lakefront and Sprecher are by far the two best breweries in the Milwaukee area. Both are pretty good tours, at Lakefront they really don't skimp on the samples. You can get a pretty good buzz from all of the samples at that one.