Pornic to Budapest

We're about seven weeks away from a new adventure.  May 1, we leave for France to ride from the Atlantic coast up the Loire valley.  We'll cross into Switzerland briefly.  We'll enter Germany to find the headwaters of the Danube and then follow the Danube east across Germany and into Austria.  We'll visit Vienna and then turn toward Budapest.  This should take about six or seven weeks.  We'll take the train to Amsterdam to see friends and then fly home from there.