The Best Resorts & Hotels with Spas in Kosai from ￥6,174 in 2026

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Our top choices for Kosai hotels with a spa

A reception desk with a sign reading 'LE SENSORIEL' and a potted plant in the foreground.

1. Grand Mercure Lake Hamana Resort & Spa

Nishi Ward

Revitalize at this lakeside resort offering traditional Japanese onsen baths and massage services amid serene garden surroundings.

￥8,798 total

Dec 1 - Dec 2

A reception desk with a glass partition, a framed artwork of a pagoda, and a small table with a calendar and a phone.

2. Hotel Route-Inn Hamamatsu Ekihigashi

Naka Ward

Relax with daily massages at this full-service spa hotel in Naka Ward, complete with restaurant dining and complimentary station transfers.

￥12,399 total

Dec 6 - Dec 7

A tented accommodation with a view of the sunset, wooden flooring, and seating areas.

3. villa vacances hamanako

Nishi Ward

Experience rejuvenating hot springs and in-room massages at this holiday park with a full-service spa for a peaceful lakeside retreat.

￥77,695 total

Dec 1 - Dec 2

A reception area with a marble counter, a small table, and a red carpet. There are shelves with various items and a sign on the wall.

4. Hamamatsu Station Hotel

Naka Ward

Rejuvenate at this hotel with daily massage services at the full-service spa, steps away from historic Hamamatsu Castle.

￥7,470 total

Nov 15 - Nov 16

An indoor swimming pool with clear views of a cityscape and mountains through large windows.

5. Gamagori Hotel

Gamagori

Bathe in soothing mineral hot springs at this Japanese retreat with deep soaking tubs and restorative spa treatments.

￥9,881 total

Nov 20 - Nov 21

Two individuals standing in a room with a desk, a lamp, and a vase of flowers.

6. Ryokan Kinsui

Kita Ward

Lakeside ryokan features in-room massages, deep soaking tubs, and natural pool for serene relaxation.

￥61,200 total

Nov 29 - Nov 30

A serene indoor pool with a wooden deck and stone accents, surrounded by wooden walls and potted plants.

7. Hiranoya

Gamagori

Luxuriate in this ryokan's restorative onsen hot springs and daily massage treatments amid tranquil garden surroundings for pure bliss.

￥19,859 total

Dec 14 - Dec 15

A hot spring bath with a view of the sea, wooden ceiling, and tiled walls.

8. Hotel Mikawa Kaiyoukaku

Gamagori

￥19,974 total

Nov 16 - Nov 17

A tranquil indoor water feature with a view of the sea, surrounded by lush greenery and a stone structure resembling a mushroom.

9. shunkeiroman ginpaso

Nishiuracho

￥71,659 total

Dec 14 - Dec 15

A panoramic view from a high vantage point, likely a hotel or resort, overlooking a city and lush greenery.

10. Tennomaru

Kota

Traditional ryokan stay with rejuvenating hot springs and spa services, ideal for tranquil cultural relaxation.

￥33,053 total

Dec 14 - Dec 15

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Choose what matters most at spa hotels in Kosai

Pool

Breakfast included

Top Kosai Hotel Reviews

Grand Mercure Lake Hamana Resort & Spa

Nishi Ward

10/10 Excellent

I really enjoyed my stay here. The onsen was so nice and well maintained. They offered drinks in a lounge like area before entering the onsen and after you get out. The local tea was so good, I think it was called usuchatou (the spelling might be wrong). The rooms were nice. The breakfast was so delicious and had a big variety. We were a group of 4 and stayed in a traditional Japanese style room and as Americans it was our first time having to lay out futons so it was fun. The staff were...

alexandra

A modern kitchen with a wooden countertop, three stools, and recessed lighting.

Hotel Route Inn Hamamatsu Dealer Dori

Higashi

10/10 Excellent

jun

Hotel Mikawa Kaiyoukaku

Gamagori

10/10 Excellent

Paul

Hamamatsu Station Hotel

Naka Ward

10/10 Excellent

This is the fourth time I have stayed here. it is very close to the Hamamatsu train station. All I needed was close proximity to train station, and a bed to sleep in at night. Free breakfast was a plus, along with the nightly complimentary drink and bowl of curry. Room is a bit cramped and bed hard but this is pretty much the norm in all japaneese hotels. Room is also dated but if you want nicer accomodations then you're going to have to pay the price. I feel that this is a bargain for what I...

dennis

Frequently Asked Questions

Looking for a spa hotel in Kosai?

Book one of our lush spa hotels and pamper yourself from the moment you arrive. Check out the beaches in Kosai - worth a picture or two! Hotels with spas are a great way to break out of your routine and add a layer of luxury to your holiday.

What's there to see and do in Kosai?

Enjoy Kosai with a stop at Lake Hamana, Arai Beach, and Arai Benten Beach. If you have a little extra time during your trip, you might want to make a stop at Sakichi Toyoda Memorial House and Maisaka Beach.

What is a Kosai spa hotel?

Spa hotels in Kosai have full on-site spas which offer services such as facials and a choice of body treatments. Some also provide a selection of in-room treatments for the ultimate luxury. Spa hotels are great for rest, rejuvenation, and relaxation.

Explore a world of travel with Expedia

Hamanako Kanzanji Onsen Vacation Rentals
Standard Link for Hamanako Kanzanji Onsen Vacation Rentals

Find Resorts & Hotels with Spas in Kosai

Change your mind

Treat yourself

Be picky

Check prices for these dates

Our top choices for Kosai hotels with a spa

1. Grand Mercure Lake Hamana Resort & Spa

2. Hotel Route-Inn Hamamatsu Ekihigashi

3. villa vacances hamanako

4. Hamamatsu Station Hotel

5. Gamagori Hotel

6. Ryokan Kinsui

7. Hiranoya

8. Hotel Mikawa Kaiyoukaku

9. shunkeiroman ginpaso

10. Tennomaru

Choose what matters most at spa hotels in Kosai

Top Kosai Hotel Reviews

Grand Mercure Lake Hamana Resort & Spa

10/10 Excellent

Frequently Asked Questions

Looking for a spa hotel in Kosai?

What's there to see and do in Kosai?

What is a Kosai spa hotel?

Explore a world of travel with Expedia