Santa Cruz Island is the second largest of the Galápagos Islands. It often serves as a starting point for tours and cruises in the Galapagos. Don’t miss the underground tunnels made out of cooled liquid magma. The most popular one is the Tunnel of Love, named after the heart-shaped hole in the ceiling. Cool off in the fresh water of Puerto Ayora, snorkel at the mangrove-framed Garrapatero Beach or visit Tortuga Bay where you can view Marine iguanas, birds or Galápagos crabs.