Trek is not for the faint-hearted but beautiful wild coves await intrepid walkers The Mazarrón Tourism Office has organised a challenging but very rewarding guided hike through the natural area of the Sierra de la Muela, Cabo Tiñoso and Roldán, in the neighbouring municipality of Cartagena. It is free to take part and will be held on Tuesday July 8 at 6.30pm. This circular route will take participants along the bottom of the Morra..