I am going to a conference in Goettingen in April and will have a free day before returning home (will save them a bundle with a Saturday night stay-over). The folks there have told me that both Hamburg or Berlin are two hour train rides away.

I have been to Berlin before. ^^

Have not been to Hamburg. So my question, please, is whether Hamburg is a good place for a day trip. Someone I know (can't remember who) was a bit down on Hamburg, but the stuff I got from Wikitravel makes it seem interesting.

Hamburg worth a day trip? Or go back to Berlin? (Or ???)

Thanks for any help.