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Check prices for these dates

Tonight
Nov 14 - Nov 15
Tomorrow
Nov 15 - Nov 16
Next weekend
Nov 20 - Nov 22
In two weeks
Nov 27 - Nov 29

Our top choices for Kosai beach hotels

A buffet line with various food items and condiments.

1. Hotel Route Inn Hamanako

Hotel Route Inn Hamanako
3.0 star property
Kosai
8.0 out of 10, Very good, (215 reviews)
The price is ￥11,109
￥12,291 total
Dec 15 - Dec 16
Hotel Route Inn Hamanako
Exterior

2. Grand Mercure Lake Hamana Resort & Spa

Grand Mercure Lake Hamana Resort & Spa
4.0 star property
Nishi Ward
8.0 out of 10, Very good, (713 reviews)
The price is ￥7,024
￥8,798 total
Dec 3 - Dec 4
Grand Mercure Lake Hamana Resort & Spa
A marina with several boats docked, a pier extending into the water, and a distant mountain range.

3. Minshuku Takahashi Kashibuneten

Minshuku Takahashi Kashibuneten
2.5 star property
Nishi Ward
9.6 out of 10, Exceptional, (61 reviews)
The price is ￥8,700
￥9,700 total
Nov 15 - Nov 16
Minshuku Takahashi Kashibuneten
A long, narrow hotel corridor with wooden doors on both sides and a carpeted floor.

4. Centurion Hotel Hamamatsu

Centurion Hotel Hamamatsu
3.0 star property
Naka Ward
8.2 out of 10, Very good, (188 reviews)
The price is ￥4,643
￥5,107 total
Nov 15 - Nov 16
Centurion Hotel Hamamatsu
A modern gym with exercise equipment, a wall of dumbbells, and large windows.

5. Crowne Plaza - ANA Hamamatsu by IHG

Crowne Plaza - ANA Hamamatsu by IHG
3.5 star property
Naka Ward
8.0 out of 10, Very good, (368 reviews)
The price is ￥6,428
￥10,198 total
Nov 29 - Nov 30
Crowne Plaza - ANA Hamamatsu by IHG
A modern library with wooden tables and chairs, bookshelves, and a large window with blinds.

6. Comfort Hotel Hamamatsu

Comfort Hotel Hamamatsu
3.0 star property
Naka Ward
8.6 out of 10, Excellent, (513 reviews)
The price is ￥6,000
￥6,600 total
Dec 14 - Dec 15
Comfort Hotel Hamamatsu
A buffet setup with various food items and serving utensils, a wooden counter, and a metallic backdrop.

7. Hamamatsu Hotel

Hamamatsu Hotel
3.5 star property
Naka Ward
8.2 out of 10, Very good, (380 reviews)
The price is ￥7,107
￥8,600 total
Nov 29 - Nov 30
Hamamatsu Hotel
A spacious lobby with a high ceiling, a central column, and a staircase leading to an upper level.

8. Okura Act City Hotel Hamamatsu

Okura Act City Hotel Hamamatsu
4.5 star property
Naka Ward
9.2 out of 10, Wonderful, (1,001 reviews)
The price is ￥15,372
￥19,219 total
Dec 13 - Dec 14
Okura Act City Hotel Hamamatsu
A hotel reception area with a reception desk, seating area, and a decorative plant in the center.

9. HOTEL SUI HAMAMATSU

HOTEL SUI HAMAMATSU
3.5 star property
Naka Ward
9.0 out of 10, Wonderful, (224 reviews)
The price is ￥6,649
￥7,406 total
Dec 13 - Dec 14
HOTEL SUI HAMAMATSU
A Daiwa Roynet Hotel with a modern design, featuring a grid of windows and a prominent hotel logo on the facade.

10. Daiwa Roynet Hotel Hamamatsu

Daiwa Roynet Hotel Hamamatsu
3.0 star property
Naka Ward
8.8 out of 10, Excellent, (1,001 reviews)
The price is ￥6,986
￥8,530 total
Nov 15 - Nov 16
Daiwa Roynet Hotel Hamamatsu
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.
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Choose what matters most at beach hotels in Kosai

Pool
Breakfast included

Top Kosai Hotel Reviews

Exterior
Grand Mercure Lake Hamana Resort & Spa

Grand Mercure Lake Hamana Resort & Spa

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...
United States
alexandra
Reviewed October 20, 2026
Grand Mercure Lake Hamana Resort & Spa

Frequently Asked Questions

What is Kosai like for travelers who love the beach?

Find a great place to stay in Kosai, which has a lot to offer the traveler looking to book a beach vacation.

When's the best time for a beach vacation in Kosai?

You can plan your beach trip with a look at weather throughout the year in Kosai: The hottest months are usually August and July with an average temp of 76°F, while the coldest months are January and February with an average of 46°F. The rainiest months in Kosai are July, June, September, and October, with each month seeing an average of 12 inches of rainfall.

What is there to see and do around Kosai?

After arriving and checking into your hotel, you'll probably want to explore your surroundings. If you're eager to check out the beaches, head to Arai Benten Beach or Maisaka Beach for some relaxation by the water. Make time for a range of local attractions, which include Lake Hamana and Arai Beach. For additional things to see and do, consider a visit to Sakichi Toyoda Memorial House or Ogaji Temple.

What's the best way to get to my beach hotel in Kosai?

This travel information can help you get to and around your beach accommodation in Kosai with ease. The closest major airport is Mt. Fuji - Shizuoka Airport (FSZ), located 38.5 mi (62 km) from the city center. If you'd like to explore around the area, you may want to rent a car for your trip.

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