Guest House Sumiya (Minshuku Sumiya) is a small guesthouse in the center of Kawayu Onsen, Wakayama, about 10 minutes by car from Kumano Hongu Taisha and the Kumano Kodo. Hot water rises from the bed of the Oto River here. Before you book, three things matter: direct bookings are taken only by email, LINE, WhatsApp or WeChat, with payment in advance; the rates are room only, with meals added on request; and the hot-spring baths are private, locked from inside.
Guest House Sumiya at a glance
| Item | Official information |
|---|---|
| Address | 1429 Hongu-cho Kawayu, Tanabe, Wakayama |
| Type | Small guesthouse (minshuku) |
| Rates | Room only, from 8,500 yen per adult (tax included) |
| Meals | Optional: dinner 3,300 yen, breakfast 1,500 yen |
| Baths | Private hot-spring baths, 15:00 to 9:00 the next morning |
| Booking | Email, LINE, WhatsApp or WeChat |
| Payment | In advance: bank transfer or payment link |
| Check-in / out | Not stated on the official pages |
| Wi-Fi | Free, throughout |
From the official site, read October 20, 2026.
How booking works at Guest House Sumiya
Which channels does the inn accept?
The inn’s reservation notice says that, from now on, direct bookings are accepted only by email, its official LINE account, WhatsApp and WeChat, with prepayment only. The English line on the home page mentions LINE, WhatsApp and WeChat. Email goes through the contact form, which asks for your name, email address, phone number and message. The site has no online booking engine. The rate page also notes that booking direct may be cheaper than other booking sites.
How do I pay?
In advance only, by bank transfer or a payment link, according to the reservation notice. Paying at the inn is not mentioned.
What is the cancellation policy?
The official pages give two different cancellation schedules, so we do not quote rates here. Ask the inn in writing which one applies to your booking. The reservation page says refunds are the prepaid amount minus the fee and the bank transfer charge, and lists cases with no fee: heavy rain, flood or storm warnings, flood danger from dam releases, suspended public transport, a state of emergency, or a matching booking made by the day before. Our hotel cancellation guide covers what to ask.
The baths at Guest House Sumiya and around Kawayu
What are the baths at the inn like?
The inn’s baths are source-flowing hot-spring baths (kakenagashi). They are private: you lock the door, so families and couples can bathe together. Shampoo and similar items are provided. Hours are 15:00 to 9:00 the next morning, and guests who are very drunk may not bathe. The official pages do not give the number or size of the baths, and there is no large shared bath.
Can I bathe with a tattoo?
The official pages do not mention tattoos. The inn’s baths are used privately, but ask before you book; the riverside baths in town are public. Our tattoo and onsen guide explains what to ask.
What is there to try on the riverbed?
Kawayu’s water rises from the Oto River. The inn’s site describes the riverside open-air bath Yakushi-no-yu, run by five guesthouses; digging your own little pool in the riverbed; and, every year from December 1 to the end of February, Sennin-buro, a large bath of 35 to 50 m built in the river.
Meals at Guest House Sumiya
What is dinner like?
Meals are optional; ask for them when you book. Dinner is 3,300 yen and changes with the season. The menu lists a duck hot pot with plenty of mushrooms, vegetable tempura, grilled Kumano river fish (sweetfish or amago), sashimi and two small dishes. Breakfast is 1,500 yen, and a Kumano lunch box for the trail is 1,800 yen. The inn has a dining room; please do not bring outside food or drink into it.
Can the inn handle allergies or a special diet?
The official pages do not mention allergies or vegetarian meals. Ask when you book. The site says bringing your own food is not banned but not recommended.
Rates and children
Rates are per person per night, room only, with tax included and the bathing tax extra. Adults means junior high school age and up.
| Season | Adult | Child sharing a futon with a parent (age 3+) |
|---|---|---|
| Weekdays | 8,500 yen | 1,500 yen |
| Night before a holiday | 9,000 yen | 1,750 yen |
| High season (July 21–August 21) | 9,500 yen | 2,000 yen |
| Golden Week, Silver Week, Obon, New Year | 10,000 yen | 2,500 yen |
From the official rate page, read October 20, 2026. Conditions may change without notice.
What do children cost?
Children up to elementary school age with their own futon pay 75 percent of the adult rate. The rate page lists the flat fees above for children aged 3 and up who share a parent’s futon, and says infants sharing a futon stay free.
Is there a bathing tax?
Yes. The inn’s rate page says prices exclude a bathing tax of 150 yen for guests of junior high school age and up. We could not check the figure on Tanabe City’s own pages. See our onsen bathing tax guide.
Rooms and house rules at Guest House Sumiya
The rooms page says the windows look over the Oto River, except in some rooms; it gives no room types or sizes. Shared facilities include free Wi-Fi, two washing machines, a massage chair, a coffee machine and a smoking area. The inn is moving to non-smoking, with smoking allowed in some rooms. Pets are not allowed; talk to the inn in advance about an assistance dog.
Getting to Guest House Sumiya
The nearest stations are JR Kii-Tanabe and JR Shingu, both with buses to the Kameya-mae stop, about 10 seconds on foot from the inn: routes 81 or 85 from Kii-Tanabe Station, 53 or 302 from Shingu Station, and 53 or 301 from Hongu Taisha. Pickup is not mentioned on the official pages.
Parking is limited and, in principle, needs a reservation. Use the gravel lot on the left; the lot on the right belongs to a neighbor. From 10:00 to 15:00, the lot is also rented to other drivers.
What foreign guests should know before staying at Guest House Sumiya
- There is no English website; most details are in Japanese. Write to the inn in simple English through one of the channels on its reservation notice and keep the reply.
- Book in writing. The official pages are not consistent about phone bookings, so do not plan on calling.
- Order dinner or breakfast when you book; rates are room only.
- Ask for your check-in time, since the official pages do not give one.
- Keep 150 yen per adult for the bathing tax, and reserve parking if you drive.
Frequently asked questions
How do I book Guest House Sumiya?
Are meals included at Guest House Sumiya?
Can I use the bath at Guest House Sumiya with a tattoo?
What is the cancellation policy at Guest House Sumiya?
How do I get to Guest House Sumiya?
Bottom line (2026): Guest House Sumiya is a small, room-only guesthouse in the center of Kawayu Onsen with private hot-spring baths and optional meals. Book in writing by email, LINE, WhatsApp or WeChat, pay in advance, and confirm the cancellation rule and check-in time with the inn.
Sources
Every fact on this page is from Guest House Sumiya’s official pages: home, reservation notice, rates and booking, meals, baths, rooms, facilities, notes, access and about (Japanese, with a few lines in English). All were read on October 20, 2026. Prices and rules change; check the official site before you book.
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