You could visit the Technikmuseum U-Boot 'Wilhelm Bauer'.
The submarine 'Wilhelm Bauer' (ex U 2540) is a technical monument. It is the only remaining submarine of type XXI. For detailed information (in German) about the submarine, you could have a look here:
The height inside of the submarine is perfect to get yourself some colourful bumps. Better be careful, I can still feel the pain :P
by train (ICE + RE) from Berlin Zoologischer Garten to Bremerhaven - ca. 4h
for connections check the timetable here
You can get around in Bremerhaven quite well by bus. Click here for timetable, ticket prices and plan of the bus network.
It's not really a local custom *g* but maybe some info's about the Tourist - Information Bremervörde will be helpful. You might contact them when you are planning your trip.
Tourist - Information Bremervörde
Mo.-Fr. 10.00 - 12.00
14.30 - 17.00
When you´re in Bremerhaven, you can reach Worpswede in ca. 1 hour by car. It became well-known, because of many artists who were living there like Otto Modersohn, Fritz Mackensen, Paula Modersohn-Becker, Rainer Maria Rilke etc.
more info´s about Worpswede (in German) on the website below:
NABU-Umweltpyramide - low-energy-house built by German society for the protection of nature
NABU-Umweltpyramide Bremervörde, Huddelberg 14, 27432 Bremervörde
We visited a business where you could watch the production of smoked fish. On the picture you can see what some of my classmates looked like and what we had to wear there ... yes, I know how it looks LOL
Unfortunately our teachers had the 'great' idea to go to the German Maritime Museum next and as you can guess, we were the 'smelling' attraction there ;-)