This is a short video guide to show people arriving at the Cancun International Airport Terminal 3 where to find the ADO buses to go to either downtown Cancun, Merida, Playa Del Carmen and with a conncection, Cozumel. The little stand with the sign is actually the ADO ticket sales for these buses. This was shot in June 2017 and in 2018, the fare is 78 pesos to go from the airport to downtown Cancun, very cheap and very comfortable.
Tip...Never take a taxi from a taxi stand in any tourist area, such as the airport, downtown ADO bus terminal or the ferry terminals as they will usually charge more than double the rate than if you can leave the grounds and just flag a taxi on the street.
If you wish to see a quick video on the Mayan Ruins near Tulum featuring a pyramid you can climb, see the YouTube https://youtu.be/XWwbpyJU7Ho If you are thinking of visiting Merida, here is a sample of some evening things to do https://youtu.be/cE8sIG9Sak8