GunnarW said:
One remark: The last big kilometer before Villar de Corrales I took another road. In fact when going up on the second mountain to Villar d C (it happens in a dense forrest) the blue line makes a curve back (just above the word "de"). I remember that there is a 3 direction split and I took straight ahead (in stead of taking right). At the next intersection I took right and I arrived at the church from Villar d C from the left side in stead of the right side.
It's clear from the aerial photos that in several places there are alternative tracks you can take - at least, in open country; aerial photos aren't much use in forests
I don't remember the track to Villar at all (well, it was 11 years ago), but I do remember having a rest on the other side and having something to drink. This route is strenuous, and really only for the fit - it took me a good 9 hours of walking from Villafranca to O C. Don't expect to find much in the way of facilities, and make sure you have plenty of water if it's a warm day.