The main goal is being comfortable and relaxed when you're staying at a spa hotel, so casual, non-restrictive clothing is recommended. While you'll likely spend much of your time in a bathrobe and slippers, these are usually waiting for guests on arrival. If you're eager to make the most of the resort's fitness facilities, pack your workout gear and trainers. Hoping to kick back and unwind in the pool or sauna? Make sure you toss a swimsuit in your bag. In addition to toiletries and other essential items, bring some extra clothes with you too. It's nice to have a clean, dry outfit to slip into after a massage or body scrub.