We had to show passports, but we knew that from our previous visit. We were booked for the tour anyway. Our tour group was very international with people from the USA, Israel and Ukraine.
There are some people who will just go for standard beers they know, but they are missing out.
I was introduced to weissbier while in Berlin. It's not everyone's cup of tea but I loved it. The pils stuff is also so much better than everywhere else too.