Gunma Prefecture punches well above its weight when it comes to outdoor leisure. Nestled in the mountains northwest of Tokyo, this compact prefecture delivers an extraordinary range of experiences: world-class ski fields dusted with powder snow, adrenaline-pumping whitewater rivers, wildlife encounters at a full-scale safari park, and one of Japan’s finest natural history museums. Add in the ritual of painting your own daruma wish doll and afternoon boat rides on crater lakes, and you have a destination that rewards active travellers at every turn. Most of these experiences are within two to three hours of Shinjuku, making Gunma an ideal base for a long weekend or a series of day trips.

Skiing at Kusatsu International Ski Resort

Kusatsu Onsen is already one of Japan’s most celebrated hot spring towns, but the ski resort that rises directly above it takes the destination into another dimension entirely. Kusatsu International Ski Resort operates across more than 30 runs ranging from wide beginner slopes to demanding mogul fields, with a vertical drop that keeps intermediate skiers busy for multiple days. A day pass costs ¥4,500, placing it among the better-value ski areas in the Kanto and Chubu regions.

The Onsen Advantage

What sets Kusatsu apart from every other ski resort in Japan is the presence of the town’s legendary thermal baths just minutes from the gondola base. After a full day on the mountain, skiers descend into a town where the Yubatake hot spring field releases steam into the cold air and a dozen public baths await. The Sainokawara outdoor bath (¥600, swimwear required) and the intimate Otakinoyu (¥600) both welcome skiers in the late afternoon. The contrast of cold mountain air and acidic mineral water is genuinely restorative. The resort operates from late December through late March, with the best snow conditions typically found in January and February.

Getting There

From Shinjuku, the JR Kusatsu Express runs to Naganohara-Kusatsuguchi Station, from where connecting buses reach the town centre in around 30 minutes. Direct highway buses from Shinjuku Busta also serve Kusatsu in approximately 3.5 hours at ¥3,200 one way, making them a convenient choice for a weekend trip.

Whitewater Rafting in Minakami

The Tone River that flows through Minakami is one of the finest whitewater rafting corridors in Japan. The rapids through the upper Tone gorge are rated Class III to IV depending on the season and water level, offering genuine excitement without requiring prior experience. Guided half-day and full-day rafting trips operate from spring through to autumn, roughly April to October, with the highest water and fastest conditions in May and June following snowmelt from the surrounding mountains.

What to Expect on the River

Most operators provide full wetsuits, helmets, and paddles, and the minimum age for the main run is typically around 13. Guides are experienced and multi-lingual, and the pre-departure safety briefing covers everything a first-timer needs to know. The gorge scenery — forested cliffs, moss-covered boulders, and the occasional glimpse of a river bird — makes the trip worthwhile even during the calmer stretches between rapids.

Booking and Access

Minakami is served by JR Joetsu Line trains from Takasaki, with the journey taking around an hour. Most rafting operators are located a short walk or taxi ride from Minakami Station, and many offer package deals that include transport from central Minakami, the guided river trip, and onsen access afterwards. Prices for a half-day rafting session start at around ¥6,000 to ¥8,000 per person, varying by operator and season.

Canyoning and Bungee Jumping in Minakami

Minakami has developed into Gunma’s undisputed outdoor adventure hub, and rafting is only the beginning. Canyoning trips take participants into narrow gorges where activities include abseiling down waterfalls, sliding along natural rock chutes, and jumping into clear mountain pools. These trips operate through summer and early autumn, and most require participants to be reasonably fit but no prior technical experience is necessary.

For those seeking a single concentrated burst of adrenaline, bungee jumping platforms operate over the Tone River area, with drops that give a sustained view of the valley below before the cord pulls tight. Check operator websites for minimum age and weight requirements. Booking in advance is strongly recommended during summer weekends when demand is high.

Gunma Safari Park

Located near Tomioka in the southern part of the prefecture, Gunma Safari Park is one of the most accessible drive-through wildlife parks in the Kanto region. Visitors travel through large enclosures in their own vehicle or aboard a park bus, watching lions, tigers, giraffes, bears, and zebras at close range.

What to See

The main safari zone contains African savanna animals as well as large carnivores, and the feeding experiences — where permitted — are particularly popular with visitors. Beyond the drive-through section, a walk-through zoo area houses smaller animals, primates, and a petting zone suitable for younger children. Adult entry is approximately ¥2,000, with reduced rates for children.

The park is most accessible by car from the Joshinetsu Expressway, and a day here pairs well with a visit to the nearby Tomioka Silk Mill (¥1,000 entry), a UNESCO World Heritage Site that preserves the French-designed brick reeling factory built in 1872.

Gunma Dinosaur Museum

Hidden away in the small town of Kanna in southern Gunma, the Gunma Dinosaur Museum is a genuinely impressive natural history institution. The collection is built around real fossil discoveries made in the prefecture and surrounding region, including near-complete skeletons and a substantial research programme. Entry costs ¥750 for adults, making it exceptional value.

The permanent galleries cover the age of the dinosaurs with impressive mounted specimens as well as the process of excavation and preparation. Temporary exhibitions frequently explore related palaeontological topics. The museum attracts visitors of all ages, and the scale of the dinosaur hall — high-ceilinged and dramatically lit — makes an immediate impression the moment you walk in.

Daruma Painting at Shorinzan Temple

Takasaki, Gunma’s largest city, produces more daruma dolls than anywhere else in Japan, and the spiritual home of this tradition is Shorinzan Darumaji Temple. The temple’s association with daruma began in the late Edo period, and today its grounds are dotted with the round, red papier-mache figures that represent the Bodhidharma and carry wishes towards fulfilment.

The Painting Ritual

Visitors can purchase blank daruma at the temple precincts in a range of sizes. The traditional ritual involves painting in one eye while making a wish, leaving the second eye blank until the wish is achieved. Small painting workshops operate near the temple and at affiliated shops in Takasaki, and participation requires no Japanese language ability. The temple itself is worth exploring, with its main hall, stone lanterns, and a hilltop location offering views over the city. Takasaki is easy to reach by JR from Ueno Station in Tokyo, making this a practical day trip addition.

Lake Haruna and Mt. Akagi Outdoor Activities

Two volcanic lakes — Lake Haruna and Lake Onuma on Mt. Akagi — offer a gentler but equally rewarding outdoor experience, particularly during spring and autumn when the foliage is at its most dramatic.

Lake Haruna

Lake Haruna sits inside the caldera of a dormant volcano at an elevation of around 1,100 metres. Rowing boats and pedal boats are available for rental by the hour, and the stillness of the water at dawn or in the late afternoon makes for memorable time on the lake. Haruna Shrine, set into the cliff face at the lake’s southern edge, is one of Gunma’s most spiritually significant sites. The approach path winds through tall cedars, and the shrine buildings themselves are strikingly positioned against rock formations.

Mt. Akagi and Ice Fishing

Lake Onuma on Mt. Akagi is beloved in winter for ice fishing (wakasagi smelt fishing through holes drilled in the ice), with rental equipment available at the lakeside. Autumn transforms the surrounding forest into intense reds and oranges, and the caldera rim walk is a popular hiking course from October. Akagi Shrine at the lakeshore is worth including in any visit.

Practical Tips

  • Transport: A rental car significantly expands access to Gunma’s outdoor sites. Pick one up at Takasaki or Maebashi. For Kusatsu and Minakami, public transport is adequate.
  • Seasonal timing: Skiing runs December to March; rafting and canyoning April to October; Haruna and Akagi foliage peaks in mid-October; ice fishing January to February.
  • Clothing: Mountain weather changes quickly. Bring layers and waterproof outer layers regardless of the season.
  • Booking: Adventure sports operators in Minakami fill quickly on weekends from May onwards. Book at least a week in advance.
  • Combining activities: A two-night base in Kusatsu allows skiing plus onsen on day one and a day trip to Minakami on day two, covering the main leisure highlights in a single trip.