Lots to choose from.
The Cancun area is a good choice (but not Cancun itself as it’s way too touristy)
But you can also try Huatulco in Oaxaca.
That area has lots of pleasant surprises, including some unspoiled beaches.

fly into cancun, but stay in the playa del carmon area

me and my go there, going again in sept its very nice

id suggest any iberostar hotel all inclusive you cant go wrong

Well I suggest going on a cruise to Mexico, I heard that Carnival Cruises are a good price and also very fun. I have never been on a Carnival Cruise but they had commercials on it and it looked like fun.Here is a commercial on youtube, you can see other commercials related to this too. I hope this helps!

~Picktowngirl77