Where has been the best brewery tour (nearby or otherwise) that you have gone on?

I think Sebago Brewing Company (in ME) is edging out Allagash (also in ME) for me. They showed me everything, answered anything, were really friendly and gave me tons of beer. If I wasn't going on 3 other tours that day I feel like I could have hung out all day and they wouldn't have minded.

Sadly, I haven't been able to tour many breweries. In fact, the only one is New Belgium, which i missed the tour hours and had to go self-guided. I did get to spend an hour or so with the master-brewer from Grand Teton brewery at a beer fest this summer. Not quite like a tour, but he seemed to enjoy letting me pick his brain. That was a great experience indeed.