Is a remarkable semi-submerged lava formation known as Los Tuneles. Here the pahoehoe lava has flowed into the sea and subsequently been eroded leaving a labyrinth of passages and archways. It is a really good site for the geology, but also for the arly colonizer vegetation and the wildlife, not just Marine Iguanas and Blue-footed Boobies, but myriads of reef fish as well as sharks, rays and turtles.