Not far from the Llano eagles is Longhorn Cavern State Park. On my last visit there I spoke with the photog on site and gave him my email. He sent me a link that they now are doing photography tours. It looks like you set up the group of between 5 and 8 folks and make a reservation.
You can Mapquest it to see your distance. The website also has a small map and weather info. But combine this with a viewing of the eagles nest, the rock buildings the CCC built at the park in the 1930s and you have a pretty good shoot.
http://www.longhorncaverns.com/photography_tour.html
Hopefully someone will want to organize a shoot there, on TPF.