I spent my holidays last week on Baltrum, a small island in the North Sea. It belongs to the East Frisian islands. Reaching it by train is a long journey, since the trains in East Frisia are slow and stopping at every milk can. From Norden you have to take the bus to Nessmersiel were you enter the ferry.
Weather was beautiful, the Beach broad, and the North Sea surf was inviting. Maybe I will make some photos available later.
You can eat excellent fish everywhere, but unfortunately most restaurants are closing at 21.00, so it is not easy to get something to eat at night. I can recommend Café Kluntje.