I was in cancun last jan. MaxQ lives and owns a min. golf coarse in Cozumel ( 40 min bus ride south to playa Del Carma and a 30 min ferry ride ) Everything is cheaper in Cozumel and Isla mujerus.
Never pay what anyone askes for negotiate every price .
As far as the ruins go , I here it sucks , long drive and really not much of a sight .
The snorkeling tour and the 4 wheeler tour are fun .
We stayed at the Coasta Real , ALL INCLUSIVE is the only way to go .
And if you ever want ANY recreational things , just ask a taxi driver.
One more thing DON"T DRIVE , the Policia will pull tourists over and ask to hold their drivers license for a week , they know you cant board the plane without it but they will offer to take 400 peso's and let you have it back .
Pissing on the side of the road at 3:00 am will cost you 400 peso's , umm I'm told