Luxury Hotel Spa
- Rooftop Infinity Onsen (8F)
- In-Room Private Open-Air Baths
- Aroma Beauty Salon
- Water Land Access
- Agoda
- Best New Ryokan Concept
- Rakuten Travel Gold Award Potential
- Hokkaido
- Excellence in Regional Gastronomy
ABOUT THE SPA
The Lake Suite Ko No Sumika is a sophisticated, "adult-oriented" luxury annex of the Toya Sun Palace Resort & Spa. Opened in 2019, it was built to offer a more private, high-end alternative to the larger family-oriented resorts in the area. The hotel is famous for its "Water Terrace" design, where the building is surrounded by reflective pools that mirror the changing colors of the Lake Toya sky.
In 2026, the hotel remains the premier spot for the Lake Toya Long-Run Fireworks Display. Because every room faces the lake and features a private terrace, guests can soak in their personal onsen while watching fireworks explode directly in front of them—an experience often described as "the best seat in Japan." For 2026, the resort has updated its Aroma Salon menu to include "Hokkaido Berry" antioxidant facials, utilizing local fruit extracts to combat the drying effects of the mountain climate.
The resort's dining experience is split between the exclusive "The Toya" Water Terrace restaurant, which serves creative kaiseki, and a high-end buffet that features seasonal Hokkaido crab, seared beef, and "Soup Curry." Guests also benefit from "dual-resort" privileges: they can enjoy the quiet, hushed luxury of Ko No Sumika’s private lounges and then walk through a connected corridor to access the expansive saunas, jacuzzis, and arcade facilities of the sister property. This makes it a rare destination that offers both secluded "Zen" peace and full-scale resort amenities.
Address:
7-1 Toyako Onsen, Sobetsu, Usu District, Hokkaido 049-5731
Floating, Infinity
The experience at Ko No Sumika is literally floating. From the moment you enter the lobby—which features a water-corridor entrance that makes the building look like it is drifting on the lake—to the rooftop baths, the design prioritizes a sensation of weightlessness. The top-floor open-air bath is engineered to stick out over the edge of the building; when you submerge, the glass and stone barriers disappear, leaving you suspended in the air between the steam and the deep blue of Lake Toya.
Everything here is about the infinity between the guest and nature. The resort’s concept, "Sumika" (meaning "residence" or "nest"), is intended to be an extension of the lake itself. The infinity aesthetic isn't just limited to the public pools; the private balcony baths are positioned so that the horizon line of the water perfectly matches the lake's surface. This creates a psychological sense of boundaryless peace, where the vastness of the Hokkaido landscape becomes your personal living room.
