Yeah Frankfurt is hardly a sightseeing paradise from the looks of it, but I might just overload on capitalist piggery and buy clothes and get drunk and hang out with my druid friend and his friends in Mannheim, which is only 30 min away by train. I'd like to visit Mainz to see what it's like, I hear it's really nice.
Heidelberg was nice but it is so touristy that I might as well not even leave Japan. I recall seeing at least 3-4 100% Japanese souvenir shops there. Druid took my mom and I up a mountain to see an old amphitheater where they held NS assembles/meetings and they have pagan festivals with hippies everywhere on Beltane and Samhuinn, that was awesome. I went bar hopping briefly but I had the flu.
Hey Cythraul if you go to Berlin you should go to K-17. "Dark Friday" is a pretty cool goth night. I had an extremely scandalous and unspeakable goth club adventure of my own there once upon a time. It is alternative/goth/metal friendly every night of the week.