A question mailed to roadtripusa.com asked which route two retirees should take to travel from Birmingham, Alabama, to a friend’s summer home in northern Vermont. While their trip will occur entirely within the United States, Canadian travelers can learn from what was recommended to them. For lodging, they prefer bed and breakfasts, but settle for motels when convenient.  Their culinary preference is to picnic, and their activity of choice is hiking. The route that best suits their needs is the Appalachian Trail.  It is one of the longest, continuously marked footpaths in the world, measuring roughly 2,180 miles in length. The Trail goes through…