As you're likely to be spending a fair amount of your time dressed in just slippers and a robe, you won't need to bring too many belongings. Besides casual clothes to slip on after your relaxing spa treatments, essential items like deodorant and a toothbrush should be right at the top of your packing list. Of course, if you intend to make use of the resort's pool or engage in exercise sessions, throw a swimming suit and some gym attire into your bag as well. Finally, leave the electronic devices behind and take some light reading instead. It is a relaxation trip, after all.