Koblenz is located within one hour travelling time of three major German airports:
Koblenz can easily be reached by train, for example from the Frankfurt/Mainz area, Cologne area or Trier. At the train station is the bus central station. From there you can reach most areas of town (bus lines run mostly from 5:30 to 23:00).
Three German motorways lead to Koblenz: A3, A48 and A61.
Many bus companies offer trips to Koblenz for one day ore more days.
Watch Soccer at the Oberwerth-Stadium and see TuS Koblenz 
Koblenz has a big shopping center (Löhr-Center) with some 130 shops, located in the city centre.
The ****-Rhein-Hotel Diehl's Terrassen is situated directly at the Rhine, below the Ehrenbreitstein castle, with a view of the Deutsches Eck from every room. Unfortunately, only a few metres from a busy railway. (Diehl's hotel)
A youth hostel is located at castle "Festung Ehrenbreitstein". From there you have a nice view over Koblenz (http://old.web02.djh.de/international/html/index_map.jsp?ID=9).