Important update regarding travel to Mexico, Canada, Central and South America, the Caribbean, and Bermuda:

For more information on travel requirements, contact the U.S. embassies of the countries you're visiting. A complete list of U.S. embassies worldwide can be found at the Department of State Web site.

When departing the Cancun airport the first thing to remember is not to stop for anyone until you are outside where the vans and cabs are awaiting travelers to take you to your hotel. As soon as you are on your way past customs there will be people asking you where you are staying. They will say they have been waiting for you and will then escort you to a desk where you will then get your first taste of Cancun's timeshare hawkers. Ignore these people. This includes the seemingly official "Tourist Information" booths that are ripoff artists operating under the guise of the airport's legitimate facade.  If you have pre-arranged transportation, they will have signs with your names on them, if not, still walk out of the airport where cabs are waiting instead of trying to find transportation from booths inside the airport (con-artists). 

 The ADO  Bus booth inside the terminal sells tickets for the bus and they are also sold outside at the bus.

 From there,  take a taxi or bus to your hotel.  Other options are shared vans,  a taxi or set up other arrangements with a private company such as Get Dita, Travelway Transfers or others.     

Some packages offer included airport transportation.  As mentioned before, do NOT stop for anyone until your find your resort company desk which is always located OUTSIDE the airport terminal.  Not only will you find time-share hawkers, but you will find people willing to "help" you or may even represent themselves as a member of your resort company.  They will literally grab your luggage from you, walk you the 15 feet and hold it until you pay them.

When boarding your transporation in a shuttle van, they may or may not wait for additional passengers.  If you are staying further from Cancun (perhaps in the Riveria Maya section or Playa del Carmen), realize that the driver will stop at every resort in Cancun first. 

 The ADO bus is direct, station to station with no stops (some buses breifly stop in Puerto Morelos).