"Saldremos a Cancún" xP or "Iremos a Cancún"
Nice! I lived there for 4 years of my life

best beach i've seen yet.
About prech's comment, lol; dont drink water from the sink tho, it isnt clean as in USA that is true.
Always watch when the bartender is serving your drink (this isnt about being México, but you never know what those guys slip into your drink no matter the country) or try to drink bottled coctails or beers and always watch when they open it

Also buy a bottle of tequila and get drunk XD
Dont forget to go to Xel-Ha, Xcaret and Chichen Izta that's my recommendations on tours

On bars I like "Bulldog Cafe" and "The city"
Have fun!!!