how to make the most of your trip to cancun:
1) rent jetskis often
2) drink all the time as long as your awake
3) bang as many hot chicks as you can but use condoms
4) relax
5) sleep from 5am - 10am NO LATER!
6) enjoy the authentic tacos
7) barter with mexicans at the market
8) Goto every bar/club you can everynight!
9) booze cruise!
that is about all there is to do that is worth while. If you want to do more than that then cancun aint the place for you. Its basically beaches, bars/clubs, restaurants and tourist shops....there aint much else to it!