I own Mayan Beach Garden Inn, the closest hotel to the Southern entrance to the Sian Ka'an and I love it there, finding every excuse to visit. When we built our Inn here, I had no idea such a remote and wonderful place existed. The beaches are amazing and you can experience the opportunity to be truly alone on the beaches. Many comments above have spoken to the tragedy of the plastic on the beaches. The Southern part of the Yucatan peninsula suffers from an extraordinary amount of garbage coming up from Central and South America. By the time the currents make it to Cancun, much of it has been raked up by caretakers along the way, leaving the Sian Ka'an to fend for itself. While we can read the labels on the bottles and see that the garbage is coming from the likes of Columbia (50%), Venezuela and Honduras (25%) and the remainder from boats (including cruise ships), it is a world wide problem solved only by minimizing single use plastic. Just this week, some large ship dumped an exorbitant amount of plastic forks, lids, plastic cups and shredded pieces of styrofoam. The small pieces mixed in with the sea grass, making it all but impossible to clean up. I don't mean to be on a soap box - but the exquisite beaches in the Sian Ka'an deserve to be clean. The sea deserves to be clean and only by using less plastic can it happen. Every visit should include a plastic bag to take some of the garbage away from the beach. It won't even make a dent, but maybe that is a bit less plastic in the stomachs of the thousands of species that find themselves living in the Sian Ka'an. By the way, the roads in the South entrance are better than the road to Punta Allen, if only because there is less traffic and the road was graded April of 2011 and don't miss Boogie Board beach or the Shipwreck. Pick up "napkin" maps at Mayan Beach Garden Inn.