Hi Seth,
I do not know what you are interested in... but there are some nice little towns there in the "south" which are very old and worth for sightseeing.
There is "breathtaking scenery" at Rhein and Mosel.
The
German (technical) Museum in Munich would be worth to visit.
I for myself would give
Frankfurt a visit as well.
As I just found Spangdahlem near by
Trier, that is a
beautiful place at the river Mosel.
Enjoy yourself!
But there is no chance to dive an Uboat...
danasan