Beach in Tulum Found: 3 | Change Filter Options Swim with Whale Sharks Experience swimming with the world's largest fish, the gentle whale shark. Get up close and personal with no danger involved. Mayan Underworld Adventure Explore the underwater world of the Caribbean with Mexico Kan Tours. Discover coral reefs, observe tropical fish, and swim through a 600 meter cenote! Sian Ka'an Wildlife Adventure Explore the wonders of Sian Ka'an on a 56 km (35 miles) boat tour. Discover reptiles, birds, and the Mesoamerican reef. Finish with a Caribbean lunch.