If you are thinking about taking the ADO bus from the Cancun Airport to Playa Del Carmen but no sure how, here if your simple guide. Most international flights arrive at Terminal 3 or the new Terminal 4 in Cancun Airport (see map below). So most of this guide will be for arrivals here.
On our recent map updating trip we stopped by Cancun's new terminal to check it out for you, obviously since we weren't flying out of terminal 4, we could only get into the departure area, not the gates or arrivals.
If you are arriving at the Cancun Airport and want to get to your vacation in the most efficient way possible, a private car service from the Cancun Airport is the best way to go. There is no waiting and your bilingual driver is there ready for you to arrive.