As far as tropical islands go, Mexico’s Isla Mujeres is a pretty sleepy one. The primary mode of transportation? Golf carts & bicycles. It has nice beaches and some good restaurants, but maybe because it’s small and close to bigger or more exciting places like Cancun or Cozumel, it seems to have avoided a lot of the craziness and big development those places are known for. The real action is in the water. In January it’s Atlantic sailfish, and in August it’s whale sharks. Different fish. Same water. Same sleepy island. In the winter months the sailfish show up to chase schools of sardines that come into the area. It’s high energy stuff, with sometimes dozens of sailfish attacking a bait ball. At one point, we counted 48 sailfish around us. They move fast, and it’s a workout to keep up with them. We were prepared to dive, but most of the action happens at the surface, so all we needed were snorkels. Same thing in August with the whale sharks. The whale sharks come in for big fish spawning events in the summer. The water gets thick with fish eggs and plankton, and the whale sharks come in to scoop them up. They’re slower moving than the sailfish, but the excitement of getting in the water with them is the same. Their size makes up for their lack of speed. It’s plenty of excitement. And besides, you can sleep back on the island.