Like many of us, the world’s largest fish prefers wintering in Baja. The slow-moving carpet shark can grow as big as a whale—more than 30 feet long—which is how it earned the confusing name whale shark. But whether it’s a whale or a shark, rest assured this gentle giant is totally benign and, to be frank, a lot more vulnerable in these waters than humans. When selecting a tour company, opt for one with a proven record of environmental responsibility like SunRider (with offices in Cabo San Lucas and La Paz) or Cabo Expeditions. Snorkeling alongside these majestic creatures is a memorable, paradigm-shifting experience, and it’s critical to observe all the restrictions in place to protect this endangered fish.