Would I have the money and free time, this would be my dream itinerary in China:

I picked only routes I know to be worth a day trip for the scenery. About a quarter of it is high-speed, the rest conventional lines. Other than major cities and archaeological sites, it could include detours to all of the Five Great Mountains, two of Buddhism's and three of Taoism's Four Sacred Mountains. I estimate that with the stops at the scenic sites, it would take me at least six weeks to complete... maybe when I'm retired :-)

_{*Lunatic*, n.
One whose delusions are out of fashion.}