When a friend is a mere four hour train ride away in a foreign country, what else is a person to do but take that train to Berlin for a day trip. My only regret, I forgot to eat a jelly donut there.
And a great day it was. We got to see a lot of history and drink a lot of beer. And, according to the app on my phone, I walked a record 28000 steps. So I have that going for me. Which is nice.