Tips for tours, great places to visit and detailed information about the whole Rhineland-Palatinate region can be found at www.romantic-germany.info. Here you will find English information about the regions Middle Rhine, Moselle, Pfalz/Palatinate, Ahr, Nahe, Rheinhessen, Eifel, Westerwald and Hunsrück.
For great information on things to do in the middle rhine, and specifically in Boppard, see the following: http://www.boppard.de