To the East of Saarbrucken is the Pfalz region - a wine region and also in earlier times, the main shoe manufacturing area of Germany. Can't give you any specific route(s) because I have family living in the area and when visiting generally just pick a sporadic route that takes me roughly in the general direction where I am hoping to end up. To this end I also have the GPS turned off so haven't even got any track logs.
Anyway, the long and the short of it is - this region is great for riding. Study the map, plan a route (any old route around the area you won't be disappointed) and let what comes be a surprise.