The family-friendly Lahn Valley cycle route is a classic riverside bike ride. It's an ADFC-certified route and has been awarded 4 out of 5 stars. It runs almost solely along the river, from the source to its mouth in the Rhine near Lahnstein. Fairytale castles and defiant forts create a distinct atmosphere. You should definitely stop off at the residence town of Weilburg with its castle and Germany's longest ship tunnel, as well as in Limburg with its seven-towered cathedral of St George. The old towns of Bad Laasphe and Wetzlar are also worth a visit. And, if you get thirsty, the region is famous for its mineral water fountains. www.daslahntal.de
