I travel at a stupid pace. My ideal day involves seeing everything, walking farther than planned, and trying one of everything, which is a wonderful way to burn through a trip and a terrible way to actually relax. Sooner or later the itinerary needs a counterweight, and in Japan nothing beats it: a long soak in an onsen.
Strip the idea to its basics and it sounds strange. A hot mineral bath, communal, with strangers, everyone naked. If you come from a culture without shared bathing, that sentence moves from relaxing outing to nightmare territory with alarming speed. My own first visit was nerves all the way through. What I did not count on is how fast the whole thing stops feeling strange, because everyone around you treats it as the least remarkable activity on earth. You may catch a glance if you are obviously foreign; nobody is studying you. Expect, however, to field questions from supremely friendly grandmothers.
The rules, quickly
Wash thoroughly with soap at the showers before you enter the shared bath; the bath is for soaking, not cleaning. Keep long hair out of the water. Take the small towel with you but never let it touch the bath surface, and leave the big towel in the dressing room. No splashing, no shouting. Use the bathing room for your gender, and when in doubt, copy the person next to you. Signs explain all of this at the entrance, and staff are patient with confused tourists. Five minutes of attention and you have the entire etiquette system.
Why Kusatsu specifically
Onsen towns are exactly what they sound like: whole towns organized around bathing, either loaded with natural springs or famous for what their springs do. Kusatsu is both. Around 32,000 liters of hot spring water erupt here every minute, the mineral content is celebrated for its health effects, and yes, the whole place carries a light whiff of rotten eggs, which is what sulfur does. Several public baths serve visitors alongside ones reserved for locals, and a full resort town has grown up around the flow.
The yubatake
The heart of Kusatsu is the yubatake, the hot water fields. The spring water arrives far too hot for anyone to survive a direct dip, so the town channels it through a grid of open, above-ground pools where the air does the cooling before the water heads to the bathhouses. It sounds purely practical and looks spectacular, especially at night when lanterns and colored lights hit the steam. Crowds gather for photos, which means waiting your turn for the obligatory picture. My favorite memory of Kusatsu is not even a bath: just walking the street after dark, watching the fields glow.
Yumomi, the cooling dance
The second cooling method is theatrical. In a small theater beside the yubatake, women with enormous paddles perform yumomi: a choreographed routine of stirring the spring water while singing, done to bring the temperature down without losing heat. Visitors get pulled in to grab a paddle and join, which makes it a show with audience participation. It is also the most popular ticket in town, so arrive early if you want a seat with a view. Standing directly in front of a participant is a mistake I made once; she moved me with the confidence of someone who has done it a thousand times. Learn from my error: do not block elderly women in Japan.
Choosing a bathhouse
With the town walked and the water cooling, it is your turn. Public bathhouses are spread along the streets, with guides available at the tourist spots to help you match a bath to your mood, and the three classics give you very different evenings:
- Otaki-no-yu is the big, showy one, famous for a series of pools that step up in heat. Whether you make it into the hottest basin is a personal negotiation, and getting asked whether you reached the last pool is the local version of a finisher's medal.
- Goza-no-yu has a warm wooden interior and a genuine community feel. It was my favorite of the three, the kind of room where the silence is comfortable rather than enforced.
- Jizo-no-yu runs timed baths: water at the extreme end, and you are meant to stay in for exactly three minutes. Whether that counts as therapy or as being microwaved depends on your tolerance.
Nothing stops you from doing more than one in an evening, and most visitors soon start treating the map like a menu. Two baths and a stroll back through the lit-up yubatake is a perfectly engineered night, and three, if your pruning fingers allow it, is a bragging right.
Eating in an onsen town
Every spa town has its snack circuit, and Kusatsu's runs along the main street toward the yubatake. First come onsen manjuu, steamed buns filled with red bean paste in several flavors; vendors push free samples on passersby, usually with green tea attached. The first time down the street I accepted a sample, was ushered into the shop with a cup of tea, and then spent twenty minutes discussing American baseball with the owners, a topic I know almost nothing about. I bought nothing and still received a wave every time I walked past afterward.
The other signature is onsen tamago: eggs slow-cooked directly in the spring water, sold in baskets, served with a small bowl and a packet of broth to pour over once you peel them. The peeling takes some coordination. The eating is excellent.
Sleeping at a ryokan
End the day at a ryokan, a traditional inn: think an elaborate bed and breakfast, often family-run, sometimes in the same hands for centuries. You sleep Japanese-style, futon on tatami, in a room that also hosts your meals. Dinner is usually included in the rate, and “included” undersells it.
The evening meal is kaiseki, the traditional multi-course format: dozens of small dishes arriving in sequence across a couple of hours, built around seasonality and the chef's own obsessions. This is not your standard sushi-and-ramen rotation; half the plate may be unidentifiable, and that is part of the fun. It also explains why ryokan ask you to check in early, and why they ask about dietary needs when you book. Breakfast gets the same treatment, served in its own dining room at my inn and every bit as lavish as dinner.
After eating past the point of reason, rest for a bit, then head out for another soak. Most ryokan in onsen towns run their own private baths for guests, quieter than the public ones and a soft landing if communal bathing still feels like a lot. Same water, fewer eyes.
Day two: Sai no Kawara
If you want a counterpoint to the town itself, take the far side of Kusatsu: Sai no Kawara, a park full of springs venting steam into the air. The scenery is the sort that makes you stop walking. Highlights include the devil's kettle, a spring that boils like a kettle and mysteriously quiets as you approach, a tiny Shinto shrine up on the hill, and a communal foot bath where you can dangle your feet under the gaze of Jizo while sitting on the rocks.
At the top sits Kusatsu's largest and most beautiful rotenburo, the outdoor bath. Most onsen are indoor affairs, wooden or stone tubs under a roof; rotenburo put you in the famous mineral water with the weather around you. Cold air plus hot water is one of the most satisfying combinations available to a human body, and the chill keeps you from getting dizzy as the heat works on you. The bath splits by gender as usual, sides swap on a schedule so you can try both, and you can hear the other half plus the park itself, which makes for a livelier soak than the quiet indoor rooms. The mineral water feels almost fizzy against the skin.
If the town walked and the water cooling is the ritual, the walk out to Sai no Kawara is the reward. Budget half a day for the park, wear the same shoes you would trust on a forest trail, and bring cash for the small shop near the springs. The steam does most of the decorating on its own; the rest of the visit is stones, water, and the sound of the valley. Compared to the busy bathhouse streets, the park feels like the town exhaled.About the healing claims
Locals will tell you the water cures everything except heartbreak, and you will hear more extravagant versions online. I have chronic health issues, which means I have heard every miracle pitch in the book, and I am not going to pretend a bath cures anything serious; the claims outrun the evidence by a mile. What I can report is subjective and honest: I felt genuinely good after bathing. It is a hot soak with better water and clean mountain air, the entire town is engineered around slowing down, and that atmosphere does something measurable to your shoulders. Maybe the minerals help the skin. Maybe the help comes from doing nothing for three days straight. Either way, I would go back.
Getting to Kusatsu
It is a trek. Take a train out of Tokyo, then a connecting bus to Kusatsu Onsen station. Ryokan often arrange pickups from the station, which removes the last bit of logistics. A day trip technically works from Tokyo but makes no sense with the transit time; staying overnight is the entire point. If you skip the ryokan pickup, the town itself is small and walkable, with local buses for the edges. From Tokyo, block out at least three hours door to station.
Should you go?
There is not a packed list of sights in Kusatsu, and that is the correct thing about it. The town exists to give you a break from your own itinerary. On a longer Japan trip, building in an onsen stay, whether here or in any other hot spring town, repays you with interest: hot water pulls the travel out of your legs and the deliberate pace resets your patience for the rest of the trip. For more Japan guides, head back to the home page.