Overview

Kawazu Nanataki Keiryu Onsen Saryo Mizumari is a three-room hot spring retreat surrounded by forest, mountain air, and the sound of the stream. Its history reaches back to 1865, when the site began as a teahouse for travellers crossing the Amagi Pass. Today, Mizumari keeps that same feeling of pause, rest, and quiet arrival.

The setting feels deeply private. Each room faces the stream, each room has its own source-flowing open-air hot spring bath, and the stay moves around simple pleasures: soaking, dining, resting, and listening to the water. Nothing feels crowded here. With only three rooms across a spacious site, time slows down naturally.

Accommodation

Mizumari has three rooms: Room 101, Room 103, and Room 105. Each room has two connected spaces, a private open-air hot spring bath by the stream, a dining area, a bedroom, a powder room, and a calm Japanese atmosphere shaped by wood, water, and forest views.

Room 101 is a special two-room suite with the largest open-air bath at the inn. The bath was added during the 2022 renewal, and the room looks across the stream toward the opposite bank. Deer, squirrels, and other small animals may appear across the water, adding to the feeling of staying deep in nature.

Room 103 also offers a two-room layout with an open-air bath and indoor bath. Its outdoor bath includes an Izu stone main bath and a smaller pot bath, which adds flexibility for families or a more relaxed bathing style. The room was renewed in December 2022 and has a wide balcony opening toward the stream and forest.

Room 105 places the focus on privacy. Renewed in 2023, it is the only room with a foot bath. The room sits in the farthest corner, with an open-air bath, foot bath, shower booth, reclining chairs, and a smooth layout between the room and bathing area. It suits a stay built around quiet time, long baths, and deep rest.

All rooms include Wi-Fi, two TVs, refrigerator, microwave, electric kettle, minibar, hair dryer, towel warmer, safe, coffee, and toiletries. Amenities include towels, bath towels, yukata, pajamas, skincare items, toothbrushes, brushes, razors, shampoo, conditioner, body soap, and other bath items.

Dining

Dining at Mizumari follows the rhythm of the season and the surrounding land. Dinner is a kaiseki meal of around eight dishes, shaped by river fish, mountain vegetables, nuts, wild plants, and, at times, local game. Seafood from nearby coastal waters also appears, bringing Izu’s mountain and sea flavours together in one meal.

The fish changes depending on what is best that day. Instead of choosing a fixed fish type, Mizumari works with a trusted seafood professional in Izu to select the freshest and most suitable catch. This gives each dinner a clear sense of season, timing, and place.

Dinner also includes drinks as part of the experience. Japanese sake, shochu, and wine are prepared, with several sake options available. The meal feels relaxed rather than rushed, letting the food, drinks, and streamside setting carry the evening.

Breakfast brings a quieter start. Expect a Japanese-style morning meal that suits the pace of the inn: warm rice, simple seasonal dishes, and comforting flavours after an early soak.

Onsen and Wellness

The hot spring is the heart of Mizumari. Every room has a private open-air bath with source-flowing natural hot spring water from Kawazu Nanataki Onsen. The water flows directly into your bath, creating a private onsen experience without shared bathing spaces or fixed bath times.

The spring is an alkaline simple spring with a smooth, gentle feel on the skin. It warms the body slowly and works well for long, quiet soaking. The water has little harshness, making the bathing experience soft and easy to enjoy.

Morning baths come with birdsong and the sound of the stream. Evening baths feel cooler and more atmospheric, with forest sounds and night air around the open-air bath. The experience changes with the hour, the weather, and the season.

Guests with tattoos

Mizumari offers private open-air baths in every room. You bathe alone or with companions of your choosing, without shared facilities. This private setting allows you to enjoy the hot spring freely and comfortably, regardless of tattoos.

Facilities

Mizumari keeps shared facilities simple so the room remains the center of the stay. The inn has a lobby, front desk, mini gallery, courtyard, vending machine, kids’ room, dagashi snack corner, parking, and delivery service. The atmosphere stays quiet and personal, with the stream and private room space doing most of the work.

Families are well supported. Kids’ amenities include small chairs, baby chairs, bouncers, sterilizing items, baby bath items, diaper bins, baby wipes, diapers, children’s drinks, snacks, and baby food options for different ages. This makes the stay easier when travelling with young children.

Free extras include ice cream, local beer, craft chuhai, and minibar drinks such as small bottles of whisky and gin, with additional items available for a charge. Mizumari also supports motorcycle travellers and those exploring Izu by bike.

Activities

The best activity here is doing less. Soak in the open-air bath, sit by the window, watch the stream, enjoy dinner in your room, and let the forest set the pace. The stay suits slow mornings, long baths, and quiet evenings more than busy sightseeing.

The surrounding Kawazu Nanataki area adds beautiful options when the mood shifts toward exploring. The nearby waterfalls, forest paths, and bridges make gentle walking easy. In early spring, Kawazu cherry blossoms bring soft colour to the area. In summer, fireflies may appear near the stream. In winter, the forest sometimes turns quiet under snow.

Additional features

Mizumari suits a stay built around privacy, hot spring bathing, seasonal food, and nature. Each room has its own source-flowing open-air bath, so the experience feels personal from start to finish. This is not a large resort or entertainment-focused hotel. Its appeal lies in space, water, stillness, and the rare feeling of having time to yourself.

Check-in starts at 15:00, with final check-in at 18:00. Check-out is at 11:00. Free parking is available, and pick-up from Kawazu Station is available for reservations made by phone or through the official website when requested in advance.