after several trips there myself and countless hours reading
posts in this forum, i(a 38/y/o man) have come up with this list
Do-not worry about the weather
Do-try a resteraunt in old cancun
Do-try to learn the language
Do-look at the ocean at least once and marvel at how crystal clear it is.
Do-be nice to the locals
Do-meet new people
Do-watch at least one sunrise and sunset.
Do-carry a pen
Do-have the time of your life.
Dont-worry about the weather
Dont-pee in public
Dont-be rude to the locals, or to anyone for that matter.
Dont-make whoppy by the pool, or you will find yourself at another hotel for the rest of your trip or in jail.
Dont-drink untill you puke or pass out
Dont-pee in the swim up bar, or any pool for gods sake.
Dont-drink so much that your friend has to write your hotel name and room number on the back of your hand and put you on the bus(see do's about pen).
Dont complain so much as you will ruin everyone elses trip.
Dont-think you are in America(UK,Ireland or other), your not.
Dont-disrespect anyone or anything.
Dont-screw up a good thing.