Tauck's tour has no opportunity to participate in a hot springs. Passengers can visit a spa in the hotel or nearby.
In Osaka,
Conrad has its own SPA. There is also a
SpaWorld
(4.5 miles away) The Spa World has an Onsen with separated by gender so no swimsuits and towels are allowed in the Onsen. However, the Spa pools & Bade Zone area on 8 will be mixed-gender so swimwear is required.
In Tokyo,
Onsen etiquette: Learn the 7 basic rules of Japan’s traditional hot spring baths
The Mandarin Oriental is at Aman Tokyo Spa (0.6 miles away)