This morning we will land in Sullivan Bay, located on the eastern coast of Santiago Island. Its lava field, covered with lava cactuses, has a variety of interesting patterns of important geologic interest, as you will be able to observe the contrasting lava landscapes from an older eruption and a newer one formed during the last quarter of the 19th century. After exploring these lava flows, you can swim or snorkel with playful sea lions. Upon arriving on Bartolome Island, you will discover a fascinating moonscape formed by various volcanic formations — including lava bombs, spatter, cinder cones — as we hike to the island’s summit for striking views of the surrounding islands, Sullivan Bay and the towering Pinnacle Rock. As the beaches at the foot of the Pinnacle Rock boast some of the finest snorkeling in the islands, you can discover a marvelous underwater world here and have a good chance of finding sea turtles gliding gently alongside you. On the rocks beneath Pinnacle Rock, it’s quite possible to spot some of the quick-as-an-arrow Galapagos penguins; at around 25 centimeters tall, these are members of the second smallest species of penguin in the world. Likewise, you’re likely to see harmless Whitetip reef sharks sunning in these waters. For many visitors, this may turn out to be the best of snorkeling experiences, as the water here is generally clear, without too much surf and full of marine life.