Sorry but the Cherry Wheat is only in America during the Food and Wine Festival. If you want to get a draft Sam Adams, go to the counter service to the left of American Adventure. The carts only serve bottles but the counter has draft.
Also, check out the Rose and Crown in the UK. They have a beer sampler where you can try all their beers at once (in seperate glasses of course). This will give you a nice overview and let you figure out what you like and don't like. Then you can go back and order more!
As for Germany, they have the gigantic 1L steins in the Biergarten. I think they're $9.60 a piece but worth every penny. If you're not a big fan of the taste of beer, try the 1/2 beer 1/2 sprite drink (can't remember the name). The wife had it and loved it.
Yes I LOVE beer. Went to London last year and it's an art form over there. The US needs more pubs!