Cancun

[Rik]

I've dove the Playa del Carmen area a lot. There are some OK Reefs there but I would agree you are better off in Coz.
The Cenotes in the Playa area are #1 Dive!
[glow=red,2,300]The Cenotes are Way C00L< INNER SPACE[/glow]!
There are some Turtles to be seen in Playa on the Tortugas Reef:Avg depth 60-70 feet, About 100ft max.
The reef in Playa are not a nice as Coz but it's sometimes not worth the hassle of getting to Cozumel and just dive the Playa side.
If you talk to most of the dive shops anyone can tell you how to get to Coz it would be a day trip, your Resort might even have a sister resort on Cozumel so check with your resort.
I'll be near Play Feb 6th to the 13th.
Dive Safe, check your rental gear before you get in the water and speak up if you don't like something!
Rik O+<