Playa de Los Guíos is a small black-sand beach tucked below the cliffs beside the marina. It is not large, and it can feel crowded quickly, but the setting is one of the most memorable on Tenerife: dark sand, blue water, boats, and the cliffs rising immediately behind.
Come for the view as much as the swim. The beach has facilities close by because the marina and resort are right there, but it still feels more dramatic than the average south-coast beach.