There is a cruise ship terminal in Hamburg, a little further in from Blohm&Voss ship yard, on the other side of Elbe... (The cruise Terminal looks like a colorfull stack of containers at first glance, there is also a small look out tower at the location, hard to miss)
For Southampton, this map should be pretty helpfull : http://www.southamptonvts.co.uk/files/pos.pdf
IIRC then Port of Rotterdam has a pretty good website with a decent map.(google might help here)