You can leave that heavy suitcase at home because you won't need to take much to the hotel. You'll likely spend a fair amount of time lounging in slippers and a robe, but usually these are provided by the resort. If you're planning to go for a splash around in the pool or engage in some water-based activities, pack a swimsuit and another set of clothes. Loose-fitting garments are the most comfortable. Considering taking a yoga class? Bring some workout attire and your favorite trainers. Oh, and don't forget your toiletries and other essential items.