Last night while we slept, the National Geographic Endeavour II rounded the northern end of Isabela Island. At first light we sailed through rolling banks of fog as we crossed Banks Bay, nearing the anchorage of Punta Espinoza at Fernandina Island. After a walk on lava flows that are hundreds of years old, we snorkeled across the bay with diving marine iguanas and foraging green sea turtles. During lunch, we repositioned to Punta Vicente Roca, and after a coastal exploration aboard our Zodiacs, we crossed the Equatorial Line during a sunset tasting of South American wines.