I went when I was 16 or so and had tonssss of fun. There’s a lot of things to do in Cancun. It’s not all bars and sluts (but there’s that too if that’s what you’re looking for).
I agree with @jonsblond I have stayed in Cancun and also Playa de Carmen. Quieter and not as crowded there.
Also Tulum is nearby, a very interesting historical site.
my boss was in the army for a long time and he was stationed in S. Korea twice. He would take trips to Thailand every once in a while, on leave and in “official duty.” He always says “Thailand is awesome. Walt Disney and Hugh Hefner got together and made that place.” Haha, what a great visual that is.
I live in Bangkok and it definitely has its, ahem, “ups and downs”, but Pattaya, almost two hours to the south, is much more of a sex joint. That being said, there are few places where easy sex is as readily available as Bangkok. Perhaps Manila is at the same level.