I would check the FAQs for your resort and the dining section as each restaurant should have info re: attire. Generally, sundresses for women, though I've also work capris to dinner. At least one pair of long pants for men and shirts with collars. I recommend trying to find a pair of shoes for the evening that goes with all of your outfits, or limit to two pairs. If you want to work out, then workout clothes. If you want to do excursions, then some shorts/t-shirts to wear off the resort.