Check out the Adventure Cycling Association's Southern Tier route. It goes from Jacksonville, FL, to San Diego, CA. Their routes are well planned out and updated every year. The maps are easy to read, show the available services and food, and (my favorite feature) are waterproof. I have used it as an umbrella and even to protect myself from mosquitoes through the sides of my hammock.

ACA is the way to go and they are the biggest name in the business.