Thanks for all the great replies!! My summer tour will most likely start in Paris, then down to a couple alp stages of the Tour, over through Switzerland, to Austria, and then from Vienna up to Prauge taking the greenway route. This is my very rough idea of what I would like to do, and would take trains as necessary, like from Paris to Lyon, or maybe to get to Vienna...so any route help would be great, I will have a month and a half, and be light camping or hostelling. Thanks again.