Kobe Tenku Onsen Ginga no Yu

Kobe Tenku Onsen Ginga no Yu is a hotel spa built around Arima Onsen's thermal waters, located in Kita Ward on the edge of the Arima Onsen district in Hyogo. The draw here is the combination of indoor and outdoor bathing, with thermal pools and rotenburo-style outdoor baths set up for soaking rather than active swimming.

Access is restricted to hotel guests, so this isn't a drop-in day-spa option — a stay at the property is the way in. That makes it a fit for couples or families already booked at the hotel who want to fold a soak into their trip rather than travel to a separate bathhouse. The upscale price tier suggests a stay-and-soak package rather than a budget bath stop.

Arima Onsen itself is one of Japan's oldest hot spring towns, and this property sits within that setting, drawing on the same mineral-rich waters the area is known for. Specific hours, entry fees, and seasonal opening of the outdoor baths aren't published, so anyone planning a visit should confirm details directly with the hotel before arrival.

There's no public information yet on changing-room amenities, towel rental, or whether tattoos are restricted, which is common practice at many Japanese onsens — worth asking the front desk when booking.