The municipality's beach is San Marcos: black sand tucked into an enclosed cove, six minutes from the old town. That cove is what makes it the area's beach for children, because the sea comes in far calmer than anywhere else on this coast.
The other thing the north has, and the south does not, are the charcos: pools carved by lava meeting the sea. The El Caletón pools in Garachico have proper access and a promenade from town. Charco del Viento, in La Guancha, does not: it is undeveloped rock, spectacular with a calm sea and a bad idea with swell.
A warning we repeat on every entry because it is in the official notices and not in the small print: with northern swell the rock pools close or turn dangerous. It is not a swimming pool, it is the open ocean with a rock wall in front.