Figure using Google Earth of approximate route from Chicavioc/Llano del Piñal up Santa Maria, as well as to Santiaguito. See text for details. The path which says "Path to ?" may go to a place I've seen marked on some maps called 'Los Achiotes' but that's all I know. Not sure about the condition of the path either, it just looks like there is one on satellite images.
Close-up of La Mesa area.