@Rondidon: Wow, it looks much better now.
The only thing I can criticize is the darkness of the shadow of the pier (quay wall?! "Kaimauer" in german).
It is much too dark - darker than the shadows of the trees. But it should be even brighter than the other shadows, because the water reflects the light of the sun.

Originally Posted By: Rondidon
FPS is ~15-20 on my Geforce 8800GTS 512MB. That`s because I didn`t optimize some things yet.
The textures of the roofs look as if you do not use mipmaps (or only 4 mipmaps?). Try to use more mipmaps (at least 10 Mipmaps), and your framerate will be much better.