Keep a camera handy. You'll find such spectacular views at every turn that you'll want to keep it close. It will save you time if you don't have to dig through your saddlebags at every stop, only to replace the camera and do it again next time you want a picture. If you can, travel with a partner. Even better is to travel with a group.
Detailed maps are better.
If you travel with a partner, make sure you EACH have a copy in case one is lost. Be sure to keep a compass with you as well. A small one will work fine. Remember to check if bicycles are allowed on main highways. Most regions do not allow this, but instead provide special bike lanes along secondary outer roads that run parallel to the highway.