When choosing what things to take with you to your spa hotel, think comfort and practicality. Leisurewear is ideal. As well as robes, most hotels provide guests with toweling slippers. However, if you're planning on taking a fitness or yoga class, pack your trusty trainers. Want to hop in the hot tub or sweat it out in the sauna? A bathing suit is a must. While spending all day in next to nothing can be blissful and fun, be mindful that dress codes may apply if you're at a high-quality resort. Put a smart outfit in your bag as well — just in case.