Float down Ancient Mayan Canals in Sian Ka'an Reserve Discover the natural beauty and wildlife of Sian Ka'an biosphere reserve on a boat trip and float down ancient Mayan canals. Muyil Ruins and Float in Sian Ka'an Maya Canals Discover the ancient Muyil ruins and float through Sian Ka'an's Maya canals on a guided full-day tour. Sian Ka'an Wildlife Adventure Embark on a boat tour of Sian Ka'an to see diverse wildlife, snorkel in the Mesoamerican reef, and relax on a pristine sandbar.