The Lake Suite Ko No Sumika (Lake Toya)

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.