Kairaku-hitou konyoku (mixed bathing) is Japanese spa culture.
Japanese Bathing Guide
Travel to Japan
The way of the travel to Japan isn't explained in this Website. There is no explanation of the way of traveling in the Japanese country, either. As for them, check in other Websites. sorry.
The notice point and so on to enjoy a Japanese hot spring is being explained in this Web site.
Japanese 'Onsen'
Hot spring exists abundantly in Japan of the volcanic islands. Source is more than 26000. more than 3000 places only in the hot spring place. All prefectures have a hot spring. Japanese people are the races which like a hot spring that much.
Japanese hot spring culture does original development. 'hot spring' and 'spa' are a little different from a Japanese sense as a meaning of the word. So, there is a movement of the way to popularize the word of 'onsen' to the world. There is an element to play certainly, the therapy, too. But, if anything, a Japanese aims at the act itself to take a bath. It relaxes by taking a bath. Therefore, it doesn't like to put on the swimsuit and to take a bath. There is stubborn belief to take a bath with no clothes on. Moreover, 'naked association' is said, and there is a custom which enjoys friendship with the stranger in the bath.
Read the explanation related to the Japanese hot spring from the upper menu. and enjoy a Japanese Onsen.