During my recent stay at the Riu Palace Riviera Maya , I decided that I wanted to be more adventurous this trip AND save money, so I took the ADO public bus from Playa del Carmen to Tulum to see the ruins. ADO’s are “first class” buses in Mexico and very comparable to American Greyhound buses with comfortable seats, strong A/C, an on-board bathroom, and small movie screens to help pass the time; however, programming is in Spanish. There are two ADO terminals in Playa, 5th Avenue and Benito Juarez which is right downtown, and the other is at 12th Avenue and Calle. 14 which is further north in town. From my prior research on the Trip Advisor Playa del Carmen forum, 5th Ave. and Benito Juarez sounded like my best departure point to get to Tulum, so I took a quick cab to Playa from the resort (USD $6).