Playa de San Marcos is the town's little Atlantic escape: a black-sand cove tucked below cliffs and village houses. It is not one of Tenerife's grand beaches, but it is a good way to finish an Icod visit when the weather is clear.
The cliffs can shade the sand early in the day, so it is usually better in the afternoon. Expect a local, low-key feel rather than a resort beach.