It depends on when you go. In winter, you may see migrating humpback whales in the Sea of Cortez. (It is on the other side of the Baja peninsula, in the Pacific Ocean, that you are likely to see California gray whales during winter.) During springtime in the Sea of Cortez you’re likely to see a great variety of whales including blue whales, fin whales, Bryde’s whales, humpbacks, and sperm whales, plus orcas, false killer whales, pilot whales, and many more.