When I was planning my destination wedding in Cancun (it was held in March 2015), the ONE thing I was concerned about was my hair! I have long, type 3A/3B hair. I can control it at home, where the humidity is 20% on average, but it gets frizzy and wild in high humidity. I talked to SO many vendors down in the Cancun area who said "oh yea, we've worked with curly hair before, it's no problem" but I didn't trust any of them... they didn't seem to understand MY hair. Seriously, my hair was my one source of stress during the wedding planning process.
Well, it IS possible to tame crazy frizzy hair down in Mexico! The woman who did my hair (Esperanza from Styling Trio) went through every single one of my curls with a curling iron, which took forever but eliminated all of the frizz and made distinct, individual curls. Then she used Paul Mitchell hair mousse to hold it, pinned it up, and sprayed it with Paul Mitchell hair spray.
A warning, though... I had my hair down but kind of tied together (not a braid, but the hair was folded over itself so it was in a mass). I wouldn't suggest using this technique and then wearing your hair completely down, because the wind will blow it all apart.
So to all you curly-haired brides: don't fret!