What to see? Touring Calais to Hamburg.

[Bretty]

Hi all,

I'm touring over to Hamburg on the next bank holiday weekend for a mates stag do.

I can't drink a lot for health reasons, so will basically spend 2 days cruising there then 2 days back.

Can anyone recommend any good roads, routes or things to see? I know it's beautiful around the Rhine? and I always like seeing World War 2 stuff. Does anyone have any suggestions?

Thanks!

Brett