I don’t have too much to say about Playa del Carmen.  I had heard it was a total party town, but it wasn’t nearly as bad as I thought.  It’s totally built around American/European tourism.  There’s multiple Starbucks on the same street and loads of restaurants and bars as well as massage spas.  I didn’t do much here except for a scuba dive.  When I was in Merida I had met a girl in my hostel room and later that night we met a guy who owned a scuba shop in Playa del Carmen.  She ended up getting her scuba certification through him so I met up with her for her last few dives.  Here’s the video.