Take a backroads trip through rolling grassy hills covered with bluebonnets and other wildflowers on The Camino Real de los Tejas National Historic Trail. See nps.gov/elte/planyourvisit/maps.htm.     Once a year, my grandmother, in her 80s and 90’s would take a trip from Kansas City to Texas to see her son and the bluebonnets. Now I understand the bluebonnet part.  I don’t think Stu or I expected the beauty of the eastern Texas hill country since neither of us had ever been there. Waving grass, wildflowers, huge skies and curving backroads is the image that comes to mind when someone says, “a perfect spring/summer day.” THAT is the eastern Texas…