The number one goal is being comfortable and relaxed when you're staying at a spa hotel, so casual, loose-fitting clothing is what most guests generally wear. While you'll probably spend a good deal of your time wearing toweling slippers and a robe, these are usually waiting for guests when they arrive. If you'd like to take advantage of the resort's fitness facilities, pack your sports gear. Hoping to release some tension in the hot tub or steam room? Don't forget to pack your swimming suit. Along with toiletries and other essential items, bring some extra clothes with you too. It's always nice to have something dry and clean to change into after a massage or body scrub.