Our greatest hits! Eight days diving the finest sites of the southern Sea of Cortez, Jacques Cousteau's "aquarium of the world," with up to four dives a day (except boarding and disembarkation days), night dives included. The route takes in Isla Cerralvo, La Reina with its epic summer baitballs (with luck, even giant mantas), the shark-patrolled seamounts of El Bajo, the volcanic pinnacles of Isla Las Ánimas, Isla San Francisco, and UNESCO-listed Isla Espíritu Santo, home to vibrant reefs as well as nearby shipwrecks (final dive sites subject to recent animal sightings, weather, and conditions). Expect swirling schools of fish, playful sea lions, moray eels, rays, large pods of dolphins, and, fingers tightly crossed, schooling hammerheads. We'll also keep eyes on the horizon for orcas and whales.