Hi LT, I'm from Germany and so is Reto on this forum. He did the wakeboard1.de page and now is busy with his film project aira71. I'm sure he will post here to.
There are a lot of cable parks in Germany, must be over 50 now, but You can also find some places to go behind a boat pretty much al over Germany.
For the cables look at:
www.wasserski.de www.wakeszene.de For boat places look at:
www.wakesport.de or send me a PM.
We'll help You out if we can.