In Cochem, Germany , we stayed in a small hotel on the Moselle river. We walked the riverbanks and took pictures of the castle at night (http://www.burg-cochem.de/lage-der-burg.html?&L=1). The contours of the neo-gothic building was more than about 330 ft above the river Moselle. Cochem Castle was built around the year 1000.
The historical mustard mill (Senfmühle), built around 1810. For around 6 Eros, take the seselbahn to the Pinnerkreuz mountain and hike up to the cross on the top of the mountain.
The Northern Medieval city gate was built in 1332. The Southern Medieval city gate is named Martinstor and built in 1935.
The Roman poet Ausonius wrote about the beauty of the meandering Moselle Valley in the 4th century, and now 1,600 years later you can walk the same path called Moselhöhenweg.
Look up Gebrüder Kolb, a family owned boat cruising company, and take a cruise on the Moselle.
Checkout the wine cellar tour and a tasting is possible at: H.H. Hieronimi, Stadionstraße 2.
Cochem gets quiet around 18:00 hours. However, make the most of the morning and the big German breakfasts most hotels offer. It is a wonderful city and fun for the family.