Beyond the River: Caves, Fishing & Highland Activities
Gujo’s outdoor activity scene isn’t only about the river. These four are spread across the wider area and cover very different kinds of days out — I’ve done all four of these myself.
Otaki Limestone Cave — the dramatic one
Otaki Limestone Cave sits a mountain over from Gujo Hachiman castle town. The standout feature: you ride a small wooden cable car to reach the entrance — a genuinely unusual, slightly theatrical way to start a cave visit. Inside, a roughly 700m viewing course leads to the main event: an underground waterfall with a 30m drop, reportedly one of the largest underground waterfalls in Japan. The sound alone, echoing through the cave before you see it, is worth the visit.
A trout pond attached to the site lets you catch your own fish and have it grilled over charcoal on the spot — a good way to turn a 30-minute cave walk into a half-day outing. Kayui-tokoro note: pets aren’t allowed inside the cave.
Miyama Limestone Cave — the vertical, adventurous one
A short drive from Otaki, Miyama takes a completely different shape: it’s a vertical shaft cave — a “3D maze”-type structure — designated a natural monument, and reportedly among the largest of its kind in Japan. Expect a lot of stairs; wear proper walking shoes, not sandals.
Beyond the standard viewing course, Miyama offers something Otaki doesn’t: caving tours, where you move through unlit sections of the cave using only a headlamp. This is a genuinely different experience from a standard cave walkthrough — more physical, more adventurous, and it needs to be booked in advance (reservation required, not a walk-up option). A viewing platform at the cave’s exit reportedly offers a view of Mt. Ontake on clear days.
Honest take: if you only have time for one cave, the choice comes down to what you want. Otaki is more visually dramatic (that waterfall) and easier underfoot. Miyama is more of an active adventure, especially if you add the caving option — but it demands more physically.
Ayu Park — hands-on river-fish experience
Officially “Seiryu Nagaragawa Ayu Park” (清流長良川あゆパーク), attached to a roadside station in the Shirotori area. The concept: get hands-on with ayu (sweetfish), the river fish the Nagara is famous for — a river recognized as a Globally Important Agricultural Heritage System (GIAHS) specifically in part for its ayu fishing culture.
You can catch ayu bare-handed in a shallow pool, try rod fishing, and then have your catch grilled and eaten on the spot. Pricing runs in layers: park entry (¥500 adult / ¥300 child), then the catching experience itself (¥500) plus ¥500 per fish caught. There’s also a trout pond, craft activities (chopstick-making, stone art), and a food program including rice-cooking and smoking experiences.
Honest take: this is a genuinely hands-on, kid-friendly activity, but English support is limited — the operator rates itself 2 out of 5 stars for English. Come prepared with a translation app for the finer details of how the catching sessions work.
Zipline Adventure Hirugano — the highland thrill
Based at Hirugano Picnic Garden, this is a proper zipline circuit: eight courses total, with tours typically covering six of them across roughly 550m of the longest run, threading through forest with views out over Hirugano Kogen and the Haku-san mountain range. A chairlift takes you up to the starting point.
Participation requires a minimum height of 120cm and a maximum weight of 120kg; elementary-school age and up can join, with a required adult-to-child ratio for younger participants. Tours run rain or shine — ponchos are available to rent if needed. This runs during green season (not winter) alongside a separate, distinct winter zipline + snowshoe package offered nearby in March.
Honest take: the forest-canopy setting is what makes this stand out from a typical zipline — it doesn’t feel like a theme-park attraction bolted onto a parking lot. Advance online booking gets a small discount over walk-up pricing.
Bokka no Sato — flowers, animals & a full day out
Also in the Hirugano Kogen area, Bokka no Sato (“Bokka” roughly translates as “pastoral”) is a broader family theme park: seasonal flower fields (tulips in spring, marigolds and petunias in autumn), animals you can interact with (sheep, horses), hands-on craft activities, and food built around Jersey-cow dairy products — soft-serve ice cream and fresh-baked bread among them. A barbecue area rounds it out.
It’s a seasonal operation (roughly mid-April to late November for the main season, with a separate winter operating period), so check current opening dates before planning around it — the park publishes exact dates each year rather than running a fixed annual calendar.
Honest take: this is squarely a family/kids destination rather than an adventure-activity stop — if you’re looking for adrenaline, the zipline next door is the better fit. If you’re traveling with young children, Bokka no Sato’s mix of animals, flowers, and food makes for an easy, low-stress full day.
Good to know across all four
- A car is genuinely necessary for all four of these. None are realistically reachable by public transport with a tight schedule — this is a real limitation if you’re relying on buses and trains for the rest of your Gujo trip. (One partial exception: the once-a-day Nagoya–Gujo–Hirugano bus does stop at Bokka no Sato — workable only if its single departure happens to fit your day. Details in our access guide.)
- English support varies significantly — none of these operators offer fluent English-language tours as standard. A translation app helps at all four.
- All are seasonal to some degree (caves are largely weather-independent, but the outdoor activities are not) — confirm current operating dates directly before visiting.
Last verified: July 2026. Prices and operating dates are confirmed as of writing but change seasonally — verify directly with each operator before your visit.