Yep, very casual any time of day or night. Bring your short's, bathing suit, flop's and you'll fit right in, of course your gonna fit in anyway, your with the best women in the world!!!
The resorts are casual. You see shorts and all kinds of casual wear. Don't feel pressured to take a lot of dress clothes. We've been on 3 resort trips and it is very laid back.
Maybe a weird question but I've not gone to a resort yet and am curious what most folks where in the evenings to eat and see the shows.