I LOVED my vacation in Playa del Carmen and the Riu Tequila was one of the primary reasons!! I posted a review on the hotel page on TA (still being published) so feel free to read it for an in depth review of the hotel.
When we arrived in PDC, we arranged round trip shuttle service with Best Day Travel ($90 TOTAL). When you leave baggage claim follow the signs to exit the airport and DO NOT SPEAK TO ANYONE. There will be tons of people trying to coerce you come to their table but JUST KEEP WALKING. Once you exit the airport, you will see all the travel/transfer people out waiting for their customers. The drive to PDC was about 40 mins (you may have to drop off other people to their hotels). Riu Tequila is in a gated community surrounded by trees and wildlife-- just gorgeous!!
We enjoyed our time there, minus the beds-- it was hard and uncomfortable. :o( The beach was breathtaking!! The walk from Riu Tequila to the beach is about 5 mins down a covered/shaded walkway. Fifth avenue was a less than 5 minute cab drive for $7 US or about a 25 minute walk. We also took a scooter (rented from Riu Tequila) to 5th as well.
Well... Enough talking, I'll just open the floor for you all to ask questions about the hotel or the city!!! Reading and asking questions on here really helped me prepare for my trip so I thought it would only be right to pay it forward!!