At Shirahama Onsen, there are three places where you can easily enjoy hot springs even on a day trip. The most recommended is the "Saki no Yu Open-Air Bath," where you can soak in hot water while enjoying the magnificent view of the Pacific Ocean. You can feel the power of nature as the big waves of the Pacific come close to the bathtub. It's recommended to visit on a sunny day, as it may be closed on bad weather days.