You'll have a great time! Cancun is a lot of fun.
Bring back some great pics to show us
I have 1 recommendation, if you go outside of the resort at night (walk around to see the sites) take a group of folks instead of going by yourself. The local law will zero in on a single tourist, say you were breaking the law (make up a charge) and load you up in the car. What they wanted was some $$ and they would not take you to jail. Found this out the hard way
but I stilled enjoyed the trip...sorry 'bout gettin on my soapbox