I Looked Into Hakone Yunohana Prince Hotel

This blog has mostly focused on researching campgrounds and day-trip hot springs, but lately I've been gradually adding more detours, like deciding to skip camping for the day and try a hotel staycation instead. This time, as one of those detours, I looked into a hot spring inn.

This time, the one that caught my attention was Hakone Yunohana Prince Hotel. Apparently it has milky-white cloudy hot spring water that's said to be at the highest elevation among the Seventeen Hot Springs of Hakone, and it also seems to be available for day-trip bathing, so I wanted to look into it first.

The Short Version

The biggest appeal seems to be that you can soak in the milky-white "Skin-Beautifying Bath," said to be rare even within Hakone, on a day trip without needing to stay overnight.
The Rakuten Mobile signal came back as a C rating according to the official tool's measurement, so that's something worth keeping in mind.

I've summarized the details below.

Apparently the Inn Located at the Highest Elevation Among the Seventeen Hot Springs of Hakone

Hakone Yunohana Prince Hotel is apparently located in the Ashinoyu area of Hakone-machi, Ashigarashimo-gun, Kanagawa Prefecture. It sits on the eastern slope of Mt. Komagatake, at an elevation of roughly 950 meters above sea level according to the official website, and it's said to be the highest-elevation hot spring inn among the Seventeen Hot Springs of Hakone. I did come across a figure of 935 meters for the elevation in some sources, but since the official website's hot spring page states "approximately 950m," there may be a slight discrepancy in how this is described across sources.

Reservations can apparently be made through the official website or by phone. It also seems possible to book through various OTAs like Jalan net and Rakuten Travel. As for room rates, I couldn't find a straightforward price list on the official website's plan page—it seems the system requires you to run an availability search to see specific figures. I did come across information suggesting rates start around 10,000 yen per room per night in general searches, but since I couldn't confirm this on the official site, it's probably best to check actual rates via availability search or by calling directly. As for check-in time, the only mention I found was "2:00 P.M." in one example plan description, without a clearly stated standard time.

The Famous Milky-White "Skin-Beautifying Bath" Can Apparently Be Enjoyed on a Day Trip Too

The biggest highlight of this inn does seem to be the outdoor "Skin-Beautifying Bath." The source is called Yunohanazawa Onsen, and the water quality is a simple sulfur spring—apparently a milky-white cloudy water that's rare even within Hakone. Only the outdoor bath uses the actual hot spring water; the indoor bath is heated tap water. It was just renovated in May 2025, and apparently uses flagstone for the tub and granite for the edging.

Day-trip bathing is apparently accepted too, with hours running from 1:00 PM to 6:00 PM on weekdays and 12:00 PM to 6:00 PM on weekends (last entry at 4:00 PM either way). Through the end of March 2026, the standard rate is apparently 2,500 yen for adults and 1,700 yen for children (with member rates and discounts also available). Since prices are set to be revised slightly starting April 2026, anyone considering a visit might want to check the official website for the latest information. The official site also clearly states that photography and audio recording are strictly prohibited inside the bathing facility, and that there's an age restriction for mixed bathing.

Checking Out the Rooms, Dining Area, and Other Facilities

All the rooms are Japanese-style, and since May 2025 the entire hotel has apparently gone non-smoking. On the top floor, there's a "Japanese-style Premier Twin" room said to offer views all the way to Sagami Bay and the Miura Peninsula, and there's also a larger Japanese-style room type that accommodates up to 5 people. The official website didn't go into detail about Wi-Fi or TV specifics for each room, but since the FAQ mentioned free Wi-Fi is available throughout the building, I got the impression that internet access in the rooms probably isn't an issue.

The dining area is on the third floor, and breakfast seems to work on a system where you choose from 7:30, 8:00, or 8:30. Dinner is mainly kaiseki-style, and there's apparently a fairly wide lineup ranging from a 4,000 yen Japanese breakfast to a 26,000 yen kaiseki plan. The lounge apparently offers free coffee and soft drinks for guests, which struck me as a nice touch for anyone who just wants to relax quietly in their room. There are 42 free parking spaces available, so arriving by car should be worry-free too.

Komorin

Just seeing photos of that milky-white cloudy water makes me curious. Since photography is prohibited there, it seems like the only way to get a feel for the actual atmosphere is to look up reviews from people who've actually been.

Rakuten Mobile Signal Conditions

Since I use Rakuten Mobile, I checked the signal at this facility's location using the official "My Area Coverage Simulation" tool, as I usually do.

The result was an overall rating of "C." Perhaps because the inn is located at a relatively high elevation, the result suggests it's worth checking the signal conditions in advance. If you're staying overnight rather than just visiting for a day-trip bath, this is probably something to keep in mind as well.

Komorin

An honest reaction: a C rating isn't the most welcome result. While you're soaking in the hot spring, it's probably fine to relax without worrying about your phone, but if you're waiting on work messages, you might want to be a bit careful.

See Rakuten Mobile Details

Getting Around to Nearby Tourist Spots

Nearby attractions include Hakone Shrine, Lake Ashi, Owakudani, and the Hakone Open-Air Museum, and it looks like many of these spots are about ten to twenty minutes away by car. Since the hotel is on the eastern slope of Mt. Komagatake, its proximity to Mt. Komagatake also seems to be one of its features. Around the Ashinoyu area, there are apparently notable spots like the Twenty-Five Bodhisattvas, Rokudo Jizo, and Shojin Pond, as well as rest stops like Uguisu Chaya and Yamabuki Chaya.

For someone like me who has a license but doesn't actually drive, access via public transportation is a concern, and it looks like the way to go is taking a bus from Odawara Station or Hakone-Yumoto Station to the "Ashinoyu" bus stop, then arranging for hotel pickup from there. Since it's apparently about 2km on foot from the bus stop to the hotel, I got the impression it's best to plan around using the pickup service. There's also apparently a reservation-based free shuttle bus from Odawara Station, though I couldn't confirm a specific timetable.

Wrapping Up

To sum things up, my impression is that Hakone Yunohana Prince Hotel is an inn where you can enjoy the milky-white cloudy "Skin-Beautifying Bath," said to be the highest-elevation among the Seventeen Hot Springs of Hakone, whether you're staying overnight or just visiting for the day. The rooms are mainly calm Japanese-style options, the kaiseki dining lineup is fairly wide, and the facilities seem well-suited to anyone who wants to spend a relaxed time in their room.

On the other hand, the Rakuten Mobile signal check via the official tool came back with a C rating. Since this is an inn located at a fairly high elevation, it might be reassuring to keep the signal situation in mind. Anyone concerned about this should probably check the official Rakuten Mobile tool before heading out.

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