What are the best best Mexico hotels?

Hi! Could I get some advice and tips from those who have been to Mexico before? We would like to head there this year to enjoy a great holiday in one of the major resort areas. It should be a really special holiday in one of their top hotels... But which are the best hotels in Mexico? Could you help me out please?

If you decide to stay in Cancun, which we very much enjoyed, then I am sure you will also like the Sheraton Hotel and Resort over there, which we also very much enjoyed. I think they have a website somewhere, on which you will be able to see that the rooms are great, as is the spa centre. What's more, the location is excellent and the staff very helpful.