The Palace Resorts.
There is like 6 hotels. It is an all-inclusive package for around $1300 or so. You stay at one and play at all. All there food and drinks are free, you get a free massage, free scuba lessons, 2 free trips (ex, Isla Muherda(sp), the jungle, the ruins).
Look up Cancun Palace. Depending on age and what u like to do, there is a perfect resort for you.