Leave that big, bulky suitcase for another trip because you won't need to take very much with you at all. You'll likely spend a fair bit of time lounging in a robe and slippers, but these are typically supplied by the resort. If you want to go for a splash in the pool or take part in some aquatic activities, pack your bathing suit and a change of clothes. Casual, loose-fitting garments are perfect. Considering using the exercise facilities? Bring sportswear and a pair of comfy trainers. Oh, and don't forget your toiletries!