Find others to ride with - ya know, that whole safety in numbers thing.
Choose a bike suitable for the task.
Apply flannel liberally. Yes, that is a flannel vest...
Don't be afraid of pushing.
Or road closed signs.
When riding for 9+ hours, instant mashed potatoes, hot coca, homemade sourdough, and some good ole blue ribbon to wash it all down make for a happy stomach.
Enjoy the views.