My wife and I are headed to the Camino for the first time in November. We will be doing the section from Sarria to Santiago.We are in our early 70's. My question regards footwear and the trail surface on that section. I had hoped to wear a pair of comfortable work boots that are well broken in (Alden 405's). However they have smooth soles, thick but not thick like a hiking boot sole. Is the surface rocky/cobbles on that section or is it mostly smooth? Thanks