Cozumel? Cancun? or Playa Del Carmen?

I have been to all three here is my take Cancun party scene for 18-21 year olds beach is great. Playa great party scene as well but up to 40 somethings 5th avenue shoppimg nice ferry over to cozumel fun. Cozumel also Great beachs at resorts small snorkeling AWESOME parties better during day when cruise ships come in I like Cozumel best I am 45. It all depends on your age I like the laid back hang out thing. If you take a taxi further up the coast of cozumel you can walk the beach. all have the blue blue water PV YUK!!! So depending on your age that is how I would choose:)