We did a really fun and unusual activity one of the first days here in Hamburg. There's a company called Twisted Rooms that specialises in creating differently themed rooms with different kinds of "missions". The participants are supposed to solve mysteries, find clues and think a lot in order to, for instance, "save the president", which is the one we tried. It was actually lots of fun and teamwork and it was perfect for a rainy Easter afternoon hour in Hamburg. I know that it sounds kind of lame when you describe it, but it's actually fun.