I have the "Monica Hair" when I get into humidity. I had a trial run with a professional hairdresser so that my MOH could learn how to do my hair since we couldn't hire anyone. We had originally done the trial to have my hair all up and I would decide if I wanted to leave it down or put it up once I got there and felt how hot and windy it would be. We decided to leave it down because of time and my MOH was having heck trying to get it to look right up. The hairdresser told me to use White Sands Medium Hold Liquid Texture. Its a heat activated hairspry. We had to buy it from her but it was amazing. It was fantastic and I didn't feel like my hair weighed a ton. It was not that windy on the beach but was VERY windy on the sailboat ride back. My hair didn't get frizzy or blow all over the place. It moved, it wasn't like my hair was stone. It was super humid too.
Plan for both and see how everything goes the first couple of days you are there then decide. So to answer your question...YES I would wear my hair down again.