Galapagos Islands, Ecuador
Credit: Paul Kennedy / Getty Images

The Galapagos Islands may be most famous for found-only-here land residents, but the National Park includes a Marine Reserve and many unique natives call the water home as well. Snorkel the warm, clear waters of the Pacific Ocean among Galapagos penguins, the only equatorial penguins found in the world, and with dolphins, sea lions and marine iguanas, the only ones on the planet known to swim. These animals, as well as scores of tropical fish, manta rays, eels, sea turtles, and reef sharks swim in shallow water just off the shore. Head to Bartolome Island, known for iconic Pinnacle Rock, or book an 11-day multi-island trip with OARS.