Just to shake up the board a bit - am I the only person traveling to Nothern Germany this summer? I'd love to see some tips about Münster, Hannover, Osnabrück, Hamburg, Lübeck, Essen...and what’s happening in Sachsen-Anhalt? It was behind the wall last time I was there, and I’d love to go have a look. We’re staying in Mettingen for ten days and just looking for day trips. We have (sadly) decided to pass on Berlin, because a day trip would barely scratch the surface. That's another whole trip! Tips welcome, or any Northern German itineraries for comparison from the few of you headed that way this summer.
ETA: before anyone tells me I'm wasting valuable touring time "up North", never fear, our following ten days are at the Bodensee (Lake Constance), so we will not go home without seeing Munich, Ludwig's castles, and the Black Forest. ;)