Oita Prefecture is famous for its intense geothermic activity. There are some great "onsen", Japanese hot springs, to enjoy when you want to go explore from your Oita hotel. Beppu city, in Oita, has the largest volume of hot water in the world after Yellowstone and the most hot spring sources in Japan. Visiting the nine Beppu Jigoku (hells) is a fascinating excursion. Highly recommended is the Oniishibozu Jigoku hell which is a mass of mud bubbles and the Tatsumaki Jigoku, which is a geyser that erupts every 30 minutes.
A must do in Beppu is a sand bath, where they cover you in warm sand and the minerals in the sand improve your complexion and alleviate muscle stiffness. The Fugu, or Globefish, in Oita Prefecture is said to be the best in Japan. Try this adventurous dish if you dare. If not prepared correctly, it can be toxic. EasyToBook.com has discount hotels in Oita Prefecture to accommodate you as you experience the south of Japan.