The Barranco de la Cala walk is just over 4 kilometers, and will take you three and a quarter hours. You pass through some lovely scenery, and will reach the beach known as La Cala.
From Portet take the Camino de la Viuda trail to the top of Calle Canario, where you will see a wooden sign indicating the way. Follow the trail till you come to a fork, marking the halfway point, and turn right. The final stretch across a ravine is quite rough. An alternative way is the trail to the left, just before reaching the La Cala beach. This trail is very uneven, but when you reach the top it becomes flat and can be followed with no difficulty to reach the Playa del Moraig beach, in the juristiction of Benitachell.
A blog of someone who walked the trail reads "Eventually you arrive at the sea, in a cluster of fishers' huts of varying and eccentric sophistication and accompanying scattered garbage. We then climbed the steep slope to the north, following the path up to the cliff side. From here the path clings to the cliffs, sometimes without any apparent support, which is a little nerve-wracking. But lavender and fennel grows everywhere, and for a while it is easy to forget the holiday homes hidden far above you, until in the end you emerge in view of the next coastal excrescence and it is time to turn for home."