I K93n Na1 Kansai 16 Hot

The "na1" designation often implies a modular control setup:

Modern onsen resort with 6 types of baths including lying-down “nureiko” bath. Direct face-off with Pacific waves. i k93n na1 kansai 16 hot

Minimalist design meets 800-year-old hot spring. Private bath in every room. Michelin-starred kaiseki. The "na1" designation often implies a modular control setup:

Cave onsen – Unique tidal cave bath accessible only at low tide. Natural hot water heated by undersea magma. Modern onsen resort with 6 types of baths

If you only have time for three out of the sixteen:

Quiet riverside onsen at the foot of Mt. Shosha. Open-air bath directly on riverbank. Famous for soba made from local buckwheat.

Vibe: Classic rotenburo with willow-lined canals.
You receive a yukata and pass to visit 7 public bathhouses. Nishimuraya is a 160-year-old ryokan serving Tajima beef kaiseki.