Just returned from the week long Michigander Bicycle Tour. This year's route was a circle ride across mid-Michigan on roads and rail trails. The weather was perfect, except for an hour's worth of rain on Wednesday.
I rode it all on my Trek Madone 5.5. There are now routes for fat tires and skinny tires.
It's amazing now how well-developed those rail trails have become. They are almost like an Interstate system for cycling.
I've posted pics and ride reports on my http://BikeFitness.net blog