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The village of Nagayu in Oita, Japan, has naturally carbonated riverside hot springs for bathing and easy access to Aso-Kuju National Park.
Beppu is like a theme park for jigoku (hells) without the rides, it's an interesting visit but expect to see man made extras, as well as natural bubbling pools of doom
Beppu Beach Sand Bath is a place to enjoy sand bathing in Beppu
Mamedacho in Hita City is nestled in a valley behind some forested hills between Fukuoka and Oita. It is a great place to explore the winding country roads in a motorbike or an open top sports car, especially in the milder months of spring and autumn.
Takegawara Onsen is a Meiji Period onsen (hot spring) where you can enjoy both a sand bath (where you're buried up to your neck in warm sand) and soak in the natural hot spring of a 19th century historic building. 
As a tourist with tattoos in Japan I have found it difficult to experience the benefits of a traditional Onsen. On many occasions I have not been able to enter the relaxing waters, at both public baths and Ryokans. Much to the disappointment of my body which had been carrying around a heavy backpack for weeks. However, all of that changed when I came across the Hyotan Hot Springs in Beppu.
Showaen is one of Beppu’s finest hot spring resorts, and boasts the oppulent Kin no Yu, Golden Springs rotenburo, with real gold tiles lining the outdoor bath.