Tennomaru A ryokan on a hill not far from Nagoya, with unreal views of the bay, the mountains, and the city lights along the coast. Quite budget-friendly, and the service is excellent. Probably not as popular because of the location. Several rooms have private rotenburo on the balcony with a view. There are also very budget-friendly single rooms for solo travelers. Two shared onsen, one on the roof and one on the first floor. The rooftop one is a rotenburo with an amazing view, even though it has a glass fence. The lower one is a nice indoor bath, with a sauna, which was under maintenance. No cold baths. Several kinds of kaiseki are served in the restaurant with a gorgeous view. The kaiseki itself is decent, but I have had better. The staff was all excellent, and surprisingly, everyone was Japanese. In the evening, the entertainment included a telescope and an older man who showed us the stars.
Tennomaru
天の丸てんのまる
A hilltop ryokan above Mikawa Bay with panoramic baths and a stargazing deck
Day Use
NoBathing & Water
Uses natural hot spring water
Open-air outdoor bath
On the roof
Enclosed indoor bathing area
Sauna room of any kind
Cold water plunge bath, typically used after sauna
Bathing Arrangements
A private bath you can reserve for yourself or your group
4 options, 3300yen 45min
Private onsen bath in guest rooms, for overnight guests only
Shared bathing area for all genders
Policies & Services
Allows entry with visible tattoos
Welcomes children and families
Site recommends the large tatami room "Oshima" for family stays with small children.
Shower, wash stations, soap and shampoo provided
On-site or nearby parking available
Views
City
Sea
MountainsAbout
Tennomaru sits on a hill above Mikawa Bay, part of the Gamagori hot-spring area. Two outdoor baths face the water, open to the bay by day and to the city lights after dark, plus two smaller baths that can be reserved for a private soak. The water in all four is clear and alkaline, locally known for leaving skin smooth. A separate indoor bath downstairs shares the same view but is filled with regular hot water rather than the spring, and some rooms come with their own open-air bath as well. The ryokan markets itself for anniversaries and family milestones and leans into it: a deck for stargazing with loaner telescopes, star-photography and calligraphy art displayed around the building, and three robot dogs that greet guests in the lobby. Reviewers describe the drive up as a narrow mountain road and the stay itself as remote and quiet, with an unbroken view from every room, bath and the dining room.
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4.0
1 review
Last updated October 5, 2026