The Romantic Road
But what you want with that info is beyond me. You will be staying in the Bavarian Forest, wich is quite a different area almost on the other side of Southern Germany. As such you will be making a cruise on the Danube, the Inn and the Ilz in Passau, not on the Rhine!
The lilac stars on the map are sights and things to do in the area you are staying in.
You also cannot go with RBO from Mitterfels to Munich, they don't go there. The buses are only supplemental to the trains in Bavaria. You have to catch the bus to Straubing and take the train from there to Munich.
Check out these websites too:
www.passau.de (Click on Tourismus on the left and then on the Union Jack for English.)