Three Tokyo Bay Onsen Stops, Depending on the Day You’re Having
Compare three Tokyo Bay day-use baths: station-side Yubune, family resort Ryugujo Mikazuki and low-cost Kajiya near Nokogiri. Check prices, access and limits.
Updated September 2026
The easiest rail-side soak, a full resort day with the kids, and a small inn bath after climbing Nokogiri are three very different outings. Along the Tokyo Bay coast, they point to Yubune Sodegaura, Ryugujo Spa Hotel Mikazuki and Kajiya Ryokan in Kanaya. Pick around your route and the time you have; comparing them by admission price alone misses what each place is for.
| Place | Best for | What to know first |
|---|---|---|
| Yubune Sodegaura | A simple rail stop or evening bath | Five-minute walk from Sodegaura Station; adult bath admission is ¥1,050 weekdays and ¥1,250 weekends, towels extra |
| Ryugujo Spa Hotel Mikazuki | A family day with pools and resort facilities | Date-based pricing; a spring-water supply interruption still affects some public-bath tubs |
| Kajiya Ryokan | A short soak after Nokogiri or the Tokyo Bay ferry | Compact inn bath near Hamakanaya; day-use access can be limited when busy |
Compare the real cost, not just the ticket
| Facility | Adult admission | Without your own towels | Best use of the visit |
|---|---|---|---|
| Yubune Sodegaura | ¥1,050 weekdays / ¥1,250 weekends and holidays | ¥1,410 / ¥1,610 with towel set | A short, easy rail-side bath |
| Ryugujo Spa Hotel Mikazuki | Date-based; recent ordinary-period guide prices were about ¥2,200 weekdays / ¥3,300 weekends | From about ¥2,750 on a weekday with towel set | Pools and resort facilities over half a day or more |
| Kajiya Ryokan | ¥800 adults | About ¥1,100 with bath- and face-towel rentals | A low-cost soak after Nokogiri or the ferry |
Mikazuki’s calendar includes special offers; ¥1,100 and ¥1,500 promotional rates are not everyday prices. In 2026, emergency maintenance also stopped spring-water supply to some public-bath tubs from March 20 while the baths themselves remained open. Check the latest operator notice rather than assuming that interruption has either ended or continued unchanged.
Compare the real cost and the type of day
| Facility | Adult admission | If you arrive without towels | Best fit |
|---|---|---|---|
| Yubune Sodegaura | ¥1,000 weekdays / ¥1,200 weekends and holidays | ¥1,360 / ¥1,560 with towel set | Train access and an evening bath |
| Ryugujo Spa Hotel Mikazuki | Date-based; recent ordinary-period guide prices were about ¥2,200 weekdays / ¥3,300 weekends | From about ¥2,750 on a weekday with towels | Pools, resort facilities and a half-day or longer |
| Kajiya Ryokan | ¥800 adults | About ¥1,100 with bath- and face-towel rentals | Low-cost bathing after Nokogiri or the ferry |
Mikazuki’s price calendar includes special offers; ¥1,100 and ¥1,500 promotional rates are not its everyday price. The operator also reported in 2026 that emergency maintenance had stopped spring-water supply to some public-bath tubs from March 20, while the baths stayed open. Check the current notice before travel rather than assuming either that the interruption has ended or that it still applies unchanged.
Yubune is the easy rail-side stop
Yubune is inside Yurimachi Sodegaura Station Mall, about five minutes from JR Sodegaura Station’s north exit. Its bath ticket includes the public sauna; a separate bedrock-bath plan makes more sense if you intend to stay for several hours.
Its hot spring is classified as an iodine-bearing sodium-chloride spring. Other pools include functional baths such as carbonated and jet baths; the natural-spring classification does not apply to every pool.
Mikazuki is priced and planned like a resort
Ryugujo bundles the public baths with indoor pool and resort facilities, with a seasonal outdoor garden pool. That scale suits a family or anyone planning to spend much of the day on site. Admission uses date-based pricing and special offers; the facility’s price page lists a towel set at ¥550, so check the actual day’s rate rather than treating a promotion as the standard ticket.
There is an important spring-water caveat. A March 2026 maintenance notice said the hot-spring supply to some public-bath tubs had stopped while the baths themselves remained open. That is different from a full closure, but it matters if natural spring water is your main reason for going. The operator’s latest notice should settle whether the interruption has since been resolved.
The garden pool’s announced 2026 season ran through September 27, so do not assume it is open outside that window.
Mikazuki is served by complimentary shuttles from Kisarazu Station and Kisarazu Kaneda Bus Terminal. The operator announced that normal shuttle service resumed on September 25, 2026; verify the current timetable before you travel. Day visitors using the baths or pools receive up to five hours of free parking, then pay ¥400 per additional hour.
The facility also announced a whole-property closure for September 8–10, 2026. Those dates have passed; use the live calendar for any new closure. Kajiya day use is usually noon to 7 p.m., but the inn may pause admission when its small bath is busy or shorten access on some weekends.
For travellers comparing other rail-connected baths, see Narita’s airport-side onsen or Haneda’s Izumi Tenku. They are separate routes rather than convenient add-ons to one Tokyo Bay day.
The garden pool’s announced 2026 season ran through September 27, so it should not be assumed open outside that window. The facility also announced a whole-property closure for September 8–10, 2026; those dates have passed, and the current calendar should be checked for any new closure. On the southbound side, Kajiya’s day-use window is usually noon to 7 p.m., but the inn may pause admission when its small bath is busy or shorten access on some weekends.
Kajiya fits naturally after Nokogiri
Kajiya is a long-running inn in the Nokogiri-Kanaya hot-spring area, not a large day-spa. Day-use admission is ¥800 for adults, ¥500 for elementary-school children and ¥300 for children aged two through preschool.
Renting both a bath towel and face towel brings an adult visit to about ¥1,100. The basic day-use window is noon to 7 p.m.
From JR Hamakanaya Station, the walk is about five minutes; Kanaya Port is roughly 1.1 km away. That makes Kajiya an easy finish after the mountain or ferry. Its bath is small, however, and the inn may pause admission when it is busy or adjust day-use availability. Call ahead if you are making the trip solely for the bath.
A sensible order for a day trip
If you are travelling from Tokyo by train and want an uncomplicated evening soak, get off at Sodegaura. For a full family day, take the bus connections to Mikazuki and allow time for the whole resort. After Nokogiri or the Kurihama–Kanaya ferry, stay in the Kanaya area and use Kajiya rather than crossing north to Kisarazu and back.
Sources
- [Yubune Sodegaura: admission and hours](https://yubune-sodegaura.jp/price), [spring](https://yubune-sodegaura.jp/onsen) and [access](https://yubune-sodegaura.jp/access) - [Mikazuki: day-use prices](https://www.mikazuki.co.jp/ryugujo/yutoasobi/price/), [spring-supply notice](https://www.mikazuki.co.jp/ryugujo/news/429), [shuttle access](https://www.mikazuki.co.jp/ryugujo/about/access/) and [garden-pool schedule](https://www.mikazuki.co.jp/ryugujo/news/571) - [Mikazuki shuttle service update](https://www.mikazuki.co.jp/ryugujo/news/685) - [Kajiya Ryokan: day-use rates](https://www.kajiyaryokan.com/price) and [official site](https://www.kajiyaryokan.com/)Checked September 27, 2026.
