Loved the Sure River bike path because it was quiet...not many tourists and Luxembourg is so laid back! The Mosel is good too...a little busier. Scenery is gorgeous all the way.

I really recommend cycyling along the river instead of cruising. There are great / safe cycle paths for you to follow and they run right along the bank of the river. You get a much closer and more intimate view of the countryside.

Last year togehther with my boyfriend we took the bike road from Saarbrucken, along the Saar River, which took us one day. Two other days of our trip we're riding along the Mosel River. This bike route is full of amzing landscapes and cosy vineyards where you can buy some local wine sorts. The most of the time you follow the Mosel Radweg signs which lead you to the city of Koblenz where the Mosel River eventually flows into the Rhine River. In three days we rode around 340km. We slept on camp sites. There are many of them which are just in the way and very close to the river, so i wasn't a problem at all to finde any of them even spontanously.