The following links lead to maps showing beaches in the general area of each town. The list starts from the area closest to Santa Cruz and works around the island counter-clockwise.

San Andrés (6 km NE of Santa Cruz)
Playa de las Teresitas - artificial, yellow sand
Playa de las Gaviotas - black sand, more secluded

Bahamar
rocky coast, mostly pebble beaches, natural rock swimming pools

Peurto de la Cruz
Playa Jardín - town's longest beach, lined with promenades and sup-tropical gardens
Playa Martiánez - rocky shores, pebbled beach
Lago de Martiánez - large freeform seawater pools over an apron of lava, safe for swimming, landscaped by César Manrique with fountains, palm trees, and sculpture

Las Américas & Los Cristianos
long stretches of artificial, yellow sand beaches, over-crowded with tourists

El Médano
several long golden beaches, excellent windsurfing conditions (see Sports & Recreation)

For more detailed information, check canarias.spainstay.com