The trolley tour of Boston, offered as an optional, is the best way to see the entire city. Take it at your own pace, but I would suggest stopping off at the USS Constitution and Fenway.
This is awesome - you have to do it - so much information about the city - it really has an amazing history.
German beer is all organic so you cant get hang overs - I dare you to test it! ;D FYI - make sure you have cash ahead of time because they don't take plastic and there isn't an ATM in sight!