What a beautiful city with so much history. The city is right on the Danube which made for a lot of pleasant walks. Other ports of call, but not listed to choose from: Vienna, Bratislava, Passau, Nurnburg, Munich, Wurtzburg, Regensburg, Durnstein, Melk, Trier. You must bring good walking shoes as all tours include some walking and so much of it is on cobblestone streets.