Overview

Spread across a large woodland site at the foot of the Nasu Mountains, Hotel Sun Valley Nasu feels more like a resort village than a single hotel. Nine accommodation buildings offer different settings, from refined Western rooms and family-focused hotels to detached forest cottages and group lodges.

The Main Hall is currently closed for renovation, but you can still stay in the other buildings and use the operating restaurants, hot spring areas, pools, play spaces, and resort facilities. Internal transport helps you move between buildings when your room, restaurant, and bath are in different locations.

Three natural sources supply sulfur water and a blended weakly alkaline and magnesium-rich spring. You can soak in milky water surrounded by cypress, move between indoor and outdoor baths, or choose a room with its own free-flowing open-air onsen.

Accommodation

Oriental Garden surrounds a central pool and has an atrium lobby, Western twin, double, and triple rooms, plus two Japanese-Western rooms. Four 40-square-metre rooms include private cypress open-air baths filled with free-flowing sulfur spring water.

Forest Villa works particularly well for a family stay. You can choose twin and triple rooms, two-level Japanese-Western rooms, or larger layouts with beds and tatami. Three rooms have private free-flowing open-air baths. An all-inclusive plan adds drinks, snacks, selected entertainment, and evening refreshments according to the current programme.

The Cottage consists of two 90-square-metre villa-style buildings with high ceilings, large windows, and spacious living areas. It gives you room to gather with family or friends, but you need to walk or use resort transport to reach the restaurants and shared hot spring facilities.

Garden Suite places Japanese, Japanese-Western, and maisonette-style Western rooms around a garden and the stained-glass Church of the Sun. Evening illumination creates an attractive setting for couples. This area has many stairs, so it may not suit you when step-free movement is important.

Owl Forest contains 30 detached cottages among the trees. Standard Western cottages accommodate two or three people, while seven include private open-air baths supplied with the free-flowing blended spring. Four dedicated cottages allow you to stay in the same room as your dog, subject to the animal-care conditions.

Queen’s Collina offers larger Western and Japanese-Western rooms inside a building with a high atrium and sweeping staircase. Several rooms have source-fed open-air baths on their balconies. Selected categories include Simmons beds, large televisions, and minibars.

Annex offers compact single, double, and twin rooms alongside a convention space. During the Main Hall renovation, you travel around 300 to 400 metres outdoors to Forest Villa or Oriental Garden for meals and bathing. An internal shuttle is available.

Seiunso is rented as an entire two-storey building for groups of eight or more. It contains four ten-tatami rooms, one twin room, shared lounges, meeting space, and separate men’s and women’s hot spring baths. It can accommodate up to 18 people and does not have an elevator.

Every room is non-smoking. Wi-Fi, towels, toothbrushes, washing products, and outdoor sandals are provided, while yukata, razors, combs, cotton items, and other supplies are available from the relevant front desk. Room bathrooms differ by building, and Seiunso does not have a private bath inside each bedroom.

Dining

Buffet dining forms the centre of the current meal experience. Dinner normally includes around 60 dishes, while breakfast offers around 40, although the exact selection changes with the restaurant and season.

Banri in Oriental Garden focuses on Chinese and Japanese food. The open kitchen prepares dishes such as dim sum, fried rice made with Nasu eggs, local chicken, Yashio pork, noodles, seafood, vegetables, and warm desserts.

Mori no Table in Forest Villa focuses on Western food while also serving Japanese dishes. Stone-baked pizza, appetisers, soba, seasonal rice, sashimi, desserts, and children’s choices allow you to build a meal that suits your appetite.

Sky Hall normally provides the resort’s Japanese buffet, but it is unavailable while the Main Hall undergoes renovation. Unless your confirmed plan names a restaurant, your dining location is assigned when you arrive and may be in a different building from your room.

Live cooking stations serve selected food as it is prepared. The buffets also include handmade desserts, local Tochigi ingredients, soft drinks, and child-friendly dishes. Local sake, wine, beer, cocktails, and other alcoholic drinks are available, with selected plans including drinks.

Onsen and Wellness

Hotel Sun Valley Nasu draws from three sources to create two main water experiences. The first is a neutral, hypotonic simple sulfur spring with hydrogen sulfide. It emerges at 42.4°C with a pH of 6.8 and develops the milky colour and distinct aroma associated with Nasu Onsen.

The second bathing water blends the Heisei no Yu and Shin-Nasu no Yu sources. It is classified as a sodium chloride and sulfate spring with a mildly alkaline pH of 8.3 and a source temperature of 63.3°C.

Traditional bathing indications include persistent muscle and joint discomfort, neuralgia, stiffness, sensitivity to cold, poor peripheral circulation, fatigue, and recovery after illness. Sulfur water may not suit sensitive or very dry skin, so keep your first soak short when you are unfamiliar with this spring type.

Yudokoro Hinoki is located in Oriental Garden and is reserved for overnight stays. The large indoor and outdoor bathing areas are built from cypress and use milky sulfur water. The outdoor area includes warmer and cooler tubs, while the bathing complex also has a water bath and sauna. Operation depends on Oriental Garden’s schedule.

Mori no Yu in Forest Villa lets you compare the blended spring with the milky sulfur source. The shared indoor and outdoor baths normally open from 14:30 until midnight and again from 5:00 until 9:30. The sauna normally closes earlier at night.

Yuyu Tengoku contains indoor baths, large sulfur open-air baths, seasonal tubs, water baths, and several sauna styles. The Main Hall remains under renovation, but Yuyu Tengoku is scheduled to reopen temporarily from July 17 to August 30, 2026. During this period, you enter through Aqua Venus, and part of the men’s bathing area remains unavailable.

Aqua Venus is an outdoor hot spring pool rather than a traditional nude-bathing onsen. The current summer layout follows a loop of around 50 metres with ten play and relaxation zones, including moving water, jets, reclining areas, and a cave-like section. It is scheduled to operate from July 17 to August 30, 2026, and requires swimwear. A separate admission applies even when you stay overnight.

There is no reservable private bath. For private natural spring bathing, choose a room specifically marked as having a free-flowing open-air onsen. These rooms are available in Oriental Garden, Forest Villa, Owl Forest, and Queen’s Collina.

Guests with Tattoos

You cannot use the shared hot spring baths, saunas, Aqua Venus, or other bathing facilities when you have tattoos. The rule does not offer an exception for small designs or tattoos hidden by cover seals.

The resort does not have a reservable private bath.

Facilities

More than 2,000 works of art are displayed throughout the resort buildings. Sun Valley Art Museum adds dedicated exhibition rooms, a café, and pottery workshops, allowing you to combine bathing with art and a hands-on creative activity.

Forest Villa has a children’s corner with picture books, blocks, and toys. A game area, table tennis, mahjong, and several karaoke rooms provide easy entertainment when you plan to stay inside the resort.

The Church of the Sun stands beside Garden Suite. Stained glass and evening garden illumination give you a pleasant place for an after-dinner walk, even when you are not attending a ceremony.

A separate pet hotel accepts small, medium, and large dogs in climate-controlled kennels. You look after your dog yourself, and animals cannot enter the restaurants, hot spring buildings, or standard accommodation areas. Owl Forest also has a small number of dedicated dog-friendly rooms.

Massage, head care, and foot treatments are provided in Queen’s Collina. Advance booking is recommended because appointment times are limited.

Shops inside Oriental Garden and Forest Villa sell local foods, Tochigi products, drinks, soft toys, and resort souvenirs. Baby chairs, children’s tableware, bathing seats, changing stations, strollers, bed guards, diaper bins, and selected baby-care equipment are also available.

Activities

Spend part of your day exploring the resort itself. You can move between the art displays, visit the museum, join a pottery session, walk through the illuminated garden, play table tennis, sing karaoke, or relax beside one of the seasonal pools.

Oriental Garden and Forest Villa each have an outdoor pool for selected summer dates. These pools are separate from Aqua Venus and are normally reserved for overnight stays in the relevant building.

The Nasu Ropeway carries you towards the ninth station of Mount Chausu. From the upper station, you can follow mountain paths towards the volcanic crater and summit, subject to weather, seasonal operation, and your hiking ability.

Nasu Highland Park is around 15 minutes away by car and combines roller coasters with gentler rides. Nasu Safari Park is around ten minutes away, while Nasu Animal Kingdom takes approximately 30 minutes.

Minamigaoka Dairy Farm is around five minutes away and offers animal encounters and food made with dairy products. Nasu Kogen Rindo Lake Family Farm combines animals, rides, outdoor activities, and lakeside scenery around 20 minutes from the resort.

Additional Features

Standard check-in begins at 14:30, and check-out is by 10:00. Annex has a later standard check-in from 16:00. Early arrival and extended departure can be requested in hourly blocks, subject to availability.

Complimentary parking is available for up to 500 vehicles in order of arrival. Winter tyres or chains are strongly recommended from late November through March because snow and ice can affect the highland roads.

A complimentary reservation-only shuttle connects the west exit of Nasu-Shiobara Station with the resort. Three services normally operate in each direction each day, with a journey time of around 40 minutes.

You can also take a public bus towards Nasu Ropeway and leave at Shin-Nasu. The resort is around three minutes away on foot from the bus stop.