Follow the road through Masca and up towards the north (if you’re coming from the south). After 2 km, park in the relatively large car park at the viewpoint.
(S/E) Take the path that climbs up the slope, on the right as you turn your back on Masca. A sign indicates "Las Portelas 2.9 km". You’ll reach a crossroads of paths.
(1) Follow the sign for “Cumbres de Bolico” to the right and reach Cumbre de Masca: views over Masca and the surrounding area.
(2) Turn back and retrace your steps to return to the viewpoint car park (S/E).