Originally Posted by
yankervitch
I think there's enough to do in Hamburg for a few days, but if they want to go a bit further afield it's a quick and lovely (~1 hr) trip on the ICE to Berlin. I get the impression there are a lot of people who do it daily to commute.
It's 1:40 - which is nearer two hours than one. And I'd save Berlin for a longer trip - there is too much to do for a day, and it would be very rushed. (And there is nothing particularly lovely about the train journey, it's all rather flat and boring!)