I have to say that there are other issues with Cancun not mentioned here . . .
At Christmas 2003 I went to Cancun on my own for 2 weeks - needed a break from the divorce of wife 1.0 - I have to say that it was one of the best and relaxing hols I had ever had.
I stayed at the Krystal Hotel, which is right at the top (north) end of the main beach in Cancun - it was great - I spent 2 weeks walking around with no shoes, no money and was totally chilled - the beach was an awesome sight - white sand - loads to do - not too many people - great night-life etc etc
The scuba-diving, hiring a moped, snorkeling, speed skating (I took my own) in amongst the MENTAL traffic on the roads, the flash flooding, the MENTAL Mexican bus drivers LOL, swimming in the sea with the baracuda and sharks was also cool!
The next year I went there again to get married to wife 2.0 and had a great time - the wedding on the beach at the JW Marriott was amazing and the absolute perfect day from start to finish - cost about £600 all in (for the marriage bit).
We had a great time.
HOWEVER in just 12 months I would say that 70% of the beach had dissappeared - in 2003 I walked the whole length of the beach without a care in the world - in 2004 there was no beach and the sand-bags that had been layed in a vain attempt to hold back the rising sea level were MASSIVE - I was shocked.
We ended up going further afield to some of the islands and other amusements which was a hassle on certain days - instead of getting up and walking out on to beautiful white sand there was nothing!
BUT we did have a brilliant time - I would love to go back there some day.
khushy