I'm going to the beach today...what should I do with my hair?

I have curlyish hair...it's not super curly, but when I go to the beach the humidity makes it frizzy and poofy all over...not my best look. What I usually do with my hair is wear it how it is naturally but blow dry it on a low setting with a diffuser so it just looks wavy, but I know that won't work for the beach unless I put it up or something. Straightening isn't an option either because the humidity will just make it curly again. So anyone have any good up do's or braided hairstyles that are good for the beach? Thanks!