Sian Ka'an Biosphere Boardwalk and Lagoon Trail

Access to Sian Ka'an Biosphere Reserve's boardwalk and lagoon trail begins at the reserve entrance south of Tulum, reached via the coastal road that turns to unpaved sandy track after the Tulum ruins; a permit fee is collected at the reserve gate and most visitors book a combined trail-and-boat tour through a licensed cooperative rather than entering independently. The walking portion covers 3 to 5 km on a flat, elevated wooden boardwalk through tropical dry forest and mangrove stands, with essentially no elevation gain and no technical difficulty, making it suitable for most fitness levels. The boardwalk surface is well-maintained but can be slick when wet, and shade is intermittent, heavier in the forest sections and sparse where the boardwalk crosses open wetland. After the walking segment, guides typically continue by small boat through a channel of ancient Maya canals into Laguna Muyil and the wider lagoon system, where the freshwater and saltwater mixing zone supports crocodiles, manatees, and wading birds. There are no potable water sources or shelters along the boardwalk itself, so visitors bring their own supplies; the boat operators provide life jackets for the lagoon portion. The natural turn-around point for those doing only the walking segment is the lagoon overlook platform at the boardwalk's end, before the boat launch.