we just got back from playa del carmen, we stayed at the grand coco bay resort which is about a mile and a half north of downtown, it was very quiet and relaxing there, but either side if your looking for a good dive trip or even certifications id recomend scuba playa for either, they were the friendliest and the most competitive shop we found out there they have some awesome wreck dives as well as cenote, and really awesome snorkel tours, and they do have profesional master divers for the outings and lessons, i got one of mine out there and my wife went on one of the adventure dives. and they are a 5 star PADI IDC shop, it would be well worth checkin out.... theyre site is
www.scubaplaya.com, hope you enjoy youself out there, we had an awesome time...