There are two pairs of isles just off the northeast coast of Santa Cruz Island. These are Gordon Rocks. Unlike most other islands described in these Galápagos travel guides, they are not explored on land. Instead, they offer some of the best scuba diving and snorkeling in the archipelago. Swimming here – the water averages 60 to 80 feet – are most of the large endemic species of fish including hammerhead sharks. Nearby are crescent-shaped twins named Islas Plazas. The visitor site you will explore is on Plaza Sur.