After two days riding with heavy legs, today I decided to take it as easy as possible; I rode slowly, in a higher gear or two than usual, coasted whenever I could - and stopped often to take photos. It felt good. The day started under heavy drizzle. I popped over the River Main to see Frankfurt Cathedral, but it was closed, semi fenced-off, and the narrow garden beside it looked unkempt. The rain thickened into a thorough downpour - and continued thus for the morning. At km40, I joined the River Rhine - and the rest of the ride was agreeably along a paved riverside path. Some bits lined with trees - the roots of which had me bumping up & down less agreeably. But pleasing riding. The River Rhine more interesting than the stretches of the Danube and the Main I saw. More river traffic; mostly long long tourist cruise boats, but also barges carrying earth(?), containers and other cargo. Many forts & castles on the hills leading down to the river, vineyards too. Hundreds of Canada geese waddled along the bank and cycle track with their half to three-quarter grown chicks, not well-disposed to making way for cyclists . . . .