I was in the town years ago. Its pretty wooded and hilly round there. I read an article on the bike park somewhere, some of the tracks are pretty tech and there are loads of roots. The standard of riding will probably be pretty high as all the Germans at Lac Blanc were ripping. Lets face it, lift assisted riding out of season would have to be pretty shit not to warrant a couple of hours driving.
Also, I guess your wife must be working somewhere like Dortmund, Dusseldorf or Cologne. These cities (indeed any city in the Rhur/Nord Rhein) are not really the most exciting places to spend a weekend.