Nasu Onsen — Royal Retreat Hot Springs

**Top onsen to visit:** Shikanoyu (鹿の湯) — the oldest and most traditional, milky sulfur water, gender-segregated baths with 6 pools of varying temperatures (41–48°C), day-use ¥500. The 48°C pool is a test of endurance. Kita-onsen Ryokan (北温泉旅館) — remote, rustic lodge with riverside rotenburo, featured in the anime 'Thermae Romae,' day-use ¥700. Ohtaka Ryokan (大鷹の湯) — upscale, alkaline spring, mountain views, day-use ¥1,000. **Mount Nasu hiking:** The Chausudake trailhead (1,400m, accessible by ropeway ¥1,800 round-trip) leads to the active volcanic peak Chausudake (1,915m, 60-min ascent). The summit vents sulfur steam and offers 360° views over Nasu Kogen and distant mountains. Combine hiking with onsen for a perfect mountain day. **Nasu Animal Kingdom (20-min drive):** A zoo focusing on animals from highland regions worldwide — alpacas, capybaras, penguins, birds of prey. Daily shows (eagle flying demonstrations, sheepdog herding). More engaging than typical Japanese zoos. Entry ¥2,600. **Dairy farms & cheese:** Nasu is known for dairy farming. Visit Nasu Cheese Garden (cheese tarts, fondue, farm tours) or Nanboku Milk Farm (fresh milk, gelato, cheese-making workshops). Both family-friendly, food excellent. **Imperial connection:** The Nasu Imperial Villa grounds are mostly closed, but the adjacent Nasu Heisei-no-Mori (Nasu Forest) is open to the public (reservation required, free) — a protected forest with guided nature walks. Limited slots, book weeks ahead online. **Luxury ryokan:** Towanosato Matsukaze (松楓楼) is Nasu's most luxurious ryokan (from ¥35,000/person), featuring private in-room rotenburo, kaiseki using local Tochigi wagyu, and impeccable service. For high-end onsen experience, this rivals anywhere in Japan. **Combine with:** After Nasu Onsen, visit Nikko (90 min by car) for shrines and Lake Chuzenji. Or explore the Nasu Kogen art museums (Nasu Stained Glass Museum, Nasu Trick Art Museum).