Start opposite El Patio Bar in Santiago del Teide, footpath is clearly defined most of the, just keep walking down hill, there are several detours on the way, one in particular leads to spectacular views down a barranco to the sea. I found it in a booklet of splendid walks in the Santiago del Teide area that I got from the tourist office in Playa de la Arena, all the walks in the booklet are clearly explained, easy to follow and can be done by using busses to reach them. If the whole walk is too much in one go it can be done in 2 stages, Santiago del Teide to Tamaimo, then Tamaimo to Los Gigantes. There are many beautiful walks in the area, I usually try and find one that ends near a tapas bar. The Tourist Office in Playa de la Arena, is a gold mine of leaflets on what to see, what to do and where to go walking in the area.