We just got back from a river cruise up the Danube on the Emerald Sun with a few extra days in Prague. Of course the camera went along.
We did the Danube from Budapest, Bratislava, Vienna, Durnstein, Melk, Cesky Krumlov (from Linz), Passau and Prague on the Emerald Sun from Emerald Cruises on their Danube Explorer plus Prague cruise.