Onsens are the best part of Japan!
Onsen are hot springs and and the bathing facilities and traditional inns around them. There are approximately 25,000 hot spring sources throughout Japan, and approximately 3,000 onsen establishments use naturally hot water from these geothermally heated springs.
A rotenburo is an open-air bath. You can enjoy bathing with the pleasant breeze blowing over the hot water surface. The rotenburo offers the exquisite charms of lounging in a hot spring set in a landscape, making you feel a part of nature.