Just a comment about the post that mentions the trash from previous campers on the beach. This trash is not from camping, it is what washes ashore from the ocean. Its pretty mind boggling when you see it, but most of the beaches along the caribbean there are groomed, raked and cleaned every day. In the Sian Kaan, there is no one to clean the beaches and what you will see is miles and miles and miles of the most gorgeous, soft white sand beaches ever, covered with trash. Mostly plastic; soda bottles, water bottles, flipflops, buoys, gas cans etc. I've spoken with environmental folks in the area and they said they have researched the trash and they have documented over 30 different countries. Supposedly alot of this trash is from illegal cruise ship dumping. I guess the way the currents run, it sends alot of this floating debris onto these beaches. Anyway, just a note. Otherwise, the Sian Kaan is an amazing place. Go enjoy it while its there because the density of tourists and hotels are creeping down from Cancun. Someday it will be all hotels I'm sure.