There is a walk from San Juan to Alcala, the best way is from San Juan end,follow footpath from Fonsalia past the new desalination plant and up the cliffs,it then changes from tarmac to stones/scree,it is narrow in some places and within six feet of the cliff edge,I thought it was alright but my wife didnt like it at all, it comes into Alcala in the streets high above stone beach not far from medical centre.