Some Restaurants:
Pizzeria Paolo - in Chio. Take away Pizza
La Pizzeria de Guia - in Guia de Isora - Italian
El Rincon de la Barriga - in Alcala - Tapas, Fish
Sauco - in Alcala - Fish and Italien inspired - nice location at the sea front
Bar Arepera kilometro 101 - in Santiago del Teide - South American, not very cozy but great Arepas
Chintuma - in Playa San Juan - Mexican cuisine - everything fresh.
Sesto Senso - in Playa San Juan opposite of the beach - Italien inspired. A bit more expensive but great quality.
100% Pan - in Playa San Juan - Award winning bakery. They serve good breakfast and if you go there on a Wednesday morning, you will find the farmers marking right in front of the bakery.
Capuccino Maria - in Puerto Santiago - Tapas und coffee at the sea front