If youre into aviation photography, at Terminal 2 at Frankfurt, there is a terrace where you can watch and do some photography. The film studio in Munchen is very nice, they filmed Das Boot there as well as Great Escape in the near area. Paulaner beer factory is also excellent. Not much besides a Red Light District near the main train station in Frankfurt, if youre into that sorta thing, but FRA has a lot of banks and businesses there and not much else. Tonight I just got back from being there, but spent most of my time in belgium and france, but I have family in the Stuttgart area. Eat the Pretzels, I live off those and beer when Im there, but German food is good. Enjoy the trip.