I’ve been charged with finding the most luxurious, exclusive spa in Japan. Anyone happen to know of it off the top of their head?
It might be difficult to find the most luxurious one. I think we’ll have to go with luxurious and famous. Still, not easy; there are over 3000 onsens (spas) in Japan. The problem is that I don’t think there is a single onsen that might be considered the most luxurious, even within the same resort area. There are several very famous places, but they are often not so exclusive, like the Dogo Onsen Honkan.
Anyway, you might want to check out the site below, for a rough idea of what’s out there:
http://japaneseguesthouses.com/hotspring.htm
I did manage to find what the least expensive onsen is: Chiyoda Onsen Ryokan in Hiroshima costs only 2500 yen per night, including two meals.
But that’s definitely not what you’re looking for.