MY Ride: The hotel shuttle is the best way to get transported to the best way to get transported to and from the airport. $14-$20 usd Varies depending on the location of the hotel. The city buses are the way to see Cancun. Reasonably priced and runs every 10-20 minutes. See your concierge for bus information.
My Diggs: Westin (Starwood Hotel) Peak $230 usd/ Non-Peak Low $100s usd