Surrounded by seasonal flowers and lush greenery, enjoy a priceless moment.

"ADVENTURES ISLAND Kotaruzawa Lodge" offers a unique retreat surrounded by seasonal flowers and lush greenery, where you can connect with nature, nurture bonds, and create cherished memories. Just a 55-minute drive from the city center, this expansive 1.2 million-tsubo property provides an array of activities to fully enjoy the great outdoors on an impressive scale. Experience a comfortable and high-quality stay paired with warm hospitality, delivering priceless family moments through outdoor adventures in a serene countryside setting unavailable in the city.

  • We stayed in a Deluxe Suite to celebrate our eldest son being accepted to his preferred high school. As a family of five, having a large Room was wonderful. On the way to the lodge, the mountain road had us wondering, “Is this really the right way?” more than once, but once we arrived, it opened up into a spacious area and was great.Since it has only just opened, everything inside was very clean and beautiful. The staff were also courteous and excellent. For bathing, we recommend Mori-no-Yu, about one minute away by car. We received tickets at check-in (it’s best to confirm details about Mori-no-Yu tickets when making your Reservation). The open-air baths were the highlight and were fantastic. In summer, walking there from the lodge also sounds nice.We had dinner in the dining room, and they even prepared a congratulatory plate for our celebration—our son looked truly happy. Thank you very much. The dinner was flawless, and our whole family was extremely satisfied. Our daughter (close in age) will be taking her high school entrance exams this year as well, and she said seriously that if she passes too, she wants us to bring her back here next year—that’s how delicious it must have been.We also had breakfast in the same dining room. It was a one-plate set plus sausages and thick-cut bacon—an impressive amount of food. We couldn’t believe everyone finished it, and everything tasted great; again, everyone was very satisfied.Because it’s a new Accommodation, everything everywhere was spotless and very comfortable. My wife kept worrying that with how stylish both the Room and exterior are—with lots of indirect lighting and latticework—cleaning must be difficult; she also wondered if some amenities might get stolen since only carefully selected items are provided. It’s unnecessary worry on her part—but I think it reflects how much she wants to come back again someday and hopes the staff will keep up their hard work so we can feel the same excitement on our next visit. We could really sense that Kotaryusawa is still evolving even further from here onward. We’re looking forward to visiting again next year—and it’s an Accommodation we’d love to visit in summer as well.Thank you so much to all of your staff members.

    ゲスト 4/2/2026
  • It had a wonderful atmosphere that felt like being abroad!We chose the plan with breakfast and dinner included.Both meals were delicious, and we were very satisfied.We couldn’t do the aerial adventure or canoeing on the day, but we did them the next morning and had a great time. It was a shame we couldn’t join the workshop—it seems you need to make a Reservation in advance.The nearby Morinoyu hot spring was also great.The pool looked fantastic, so we’d love to come back during summer vacation.

    a010 3/31/2026

Facilities and Services

See All
  • Pet-friendly
  • Accessibility
Sauna / Outdoor pool
IN15:00~22:00
OUT11:00
Number of rooms60 rooms
PetPermitted
Your childPermitted

[Spring Limited | Koyarunagare Onsen – Mori no Yu Free Pass Included | Early Bird 45] Save with an early Reservation made at least 45 days in advance! Breakfast included.

IN 15:00~19:00
OUT 11:00
¥35,740
Breakfast included ; 2 peopleTax included¥31,456
(USD 197.38)

【Early Bird Discount 45│With Breakfast】Save with an early reservation 45 days in advance! Experience a nature-filled resort.

IN 15:00~19:00
OUT 11:00
¥35,740
Breakfast included ; 2 peopleTax included¥31,456
(USD 197.38)

Dog-Friendly Only [Spring Limited | Includes an Onsen “Mori-no-Yu” Free Pass at Koyaryu Onsen] Includes a Dog Run Pass for Doggy’s Island / Room Only

IN 15:00~19:00
OUT 11:00
¥35,820
No meals ; 2 peopleTax included¥31,524
(USD 197.81)

*For Guests with Dogs Only* [Standard | No Meals Included] Includes Doggies Island Dog Run Pass!

IN 15:00~19:00
OUT 11:00
¥39,660
No meals ; 2 peopleTax included¥34,908
(USD 219.04)

[Spring Limited | Koyarunagare Onsen – Mori no Yu Free Pass Included | Early Bird 45] Save with an early Reservation made at least 45 days in advance! Breakfast included.

IN 15:00~19:00
OUT 11:00
¥37,340
Breakfast included ; 2 peopleTax included¥32,864
(USD 206.22)

【Early Bird Discount 45│With Breakfast】Save with an early reservation 45 days in advance! Experience a nature-filled resort.

IN 15:00~19:00
OUT 11:00
¥37,340
Breakfast included ; 2 peopleTax included¥32,864
(USD 206.22)

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Introduction of the Accommodation

Exterior
Exterior
Dog Run
Gazebo
Exterior
Exterior
Into Nature - Experience the Wonders of Nature

A day surrounded by the nature of Satoyama is filled with various experiences. Feel the breeze and sunlight, dip your feet in the water, and take a deep breath of the clear forest air... Every moment spent enjoying activities becomes a treasure, bringing heartfelt fulfillment to each member of your family.

Workshop
Canoeing
Activities
Activities
Workshop
Canoeing
Activity - Activities & Workshops

Immerse yourself in the serene nature of Satoyama while enjoying canoeing or stand-up paddleboarding. Glide across the calm waters and feel a deep connection with nature. In July 2025, a 60-meter-long aerial adventure course will open, offering an exciting athletic experience! Join workshops featuring leather crafting, tile art, paracord creations, and more to create unforgettable memories with your family while honing your creative skills.

Pool
Pool
Pool
Pool
Pool & Sauna

The pool surrounded by nature features a sauna and a jet bath, offering enjoyment for both adults and children alike.

Guest Room
Guest Room
Guest Rooms
Guest Room
Guest Room
Guest Room
Stay - Guest Rooms

All rooms are suites with terraces. We offer nine types of accommodations, including rooms overlooking the lush fairways of Chiba Birdie Club and rooms where you can stay with your beloved dog.

Local Food
Local Food
Local Food
Local Food
Local Food
Local Food
Food Experience - Exquisite Local Cuisine

We offer a menu featuring carefully selected ingredients from the Yachimata area and Chiba Prefecture. Enjoy a wide variety of dishes and experience satoyama gourmet in various styles. Savor the unique flavors of this region to your heart's content.

Facilities and Equipment of Accommodation

  • The room
    The room
  • Facilities & Services
    Facilities & Services
  • Meal
    Meal

Notice from the Accommodation

  • Limited-Time Plan with Free Pass to “Koyaryu Onsen Mori-no-Yu”

    Now on sale for a limited time: Plan with a “Koyarunagare Onsen Morinoyu” free pass!
    ■Eligible stay period: February 1, 2026 – April 29, 2026

    Surrounded by lush nature, enjoy the luxurious hot spring water that wells up in Koyarunagare.
    Relax and unwind in the large public bath and open-air bath, and savor the gentle water that warms you to the core.

    During your stay (from check-in to check-out), you may use “Koyarunagare Onsen Morinoyu” as many times as you like.
    * The Morinoyu free pass will be provided at check-in (one per guest) only to guests staying during the eligible period above who have made a Reservation for a ticket-included Plan.
    * “Koyarunagare Onsen Morinoyu” is about a 10-minute walk or about a 3-minute drive from our Accommodation.
    * Dogs are not permitted to use Morinoyu.
    * Morinoyu hours: 10:00–22:00 (last entry 21:00)
    * Use of adult in-house wear and the relaxation room is available for an additional fee.
    * For bathing guidelines and precautions, please refer to the official “Koyarunagare Onsen Morinoyu” website.

  • Aerial Adventure NOW OPEN!

    The full-scale 60-meter “Aerial Adventure” athletic course opens in July 2025!

    Choose from two courses with different difficulty levels and styles: the “Adventure Course” and the “Challenge Course”.
    Guests staying at our Accommodation can use it free of charge.
    Our trained staff will be on hand to assist, so everyone from children to adults can enjoy safely.

    This thrilling aerial adventure—hard to experience in everyday life—is perfect for making memories with family and friends. Enjoy a one-of-a-kind experience that lets you feel truly connected with nature.


    [Usage Restrictions]
    Height: 120 cm or taller / Weight: under 120 kg
    *Even if you meet these requirements, participation may be refused if a harness or other equipment cannot be fitted properly.*

  • "Trending Sport" Pickleball

    The trending sport—Pickleball is now open!

    A new, exciting sport gaining attention worldwide—Pickleball—is now open in the nature-rich Kotaryu area!
    Often described as the best of both tennis and table tennis, it features easy-to-handle paddles and simple rules.
    It’s easy for first-timers to enjoy right away, making it a fun activity for everyone—from adults to children—regardless of age.

    Under the blue sky, surrounded by rustling trees and birdsong, enjoy a rally while feeling the breeze and naturally refresh both body and mind.
    In the open-air setting unique to outdoor play, move freely and spend a smile-filled time together.

    *The pickleball court is about 10 minutes by car from the Hotel (free parking available).*

Basic Information

Card information
VISA / MASTER / JCB / AMEX / DINERS / UnionPay / Debit card
Pets
Permitted
● ¥5,500 per night per dog (tax included) *Please present proof of vaccination for "rabies within one year of vaccination" and "5 or more combination vaccines within the validity period" upon check-in.
Breakfast"Brekkie Style" offers a one-plate breakfast featuring sausages, bacon, and sunny-side-up eggs. Enjoy a salad plate made with locally sourced vegetables selected by our chef, along with soup and cereals available in a bar-style setting.
Your child
You can stay.
[Children's Rates Information] - Our accommodation categorizes children based on their age. Please make your reservation according to the appropriate age category. ● 0-3 years old: Infant (No meals, no bedding) ● 4-6 years old: Infant (With meals, with bedding) ● 6-12 years old (Elementary school students): Elementary School Student (Lower or Upper Grades) * Child Sharing Existing Bedding is only available for children aged 3 and under. Accommodation fees apply for children aged 4 and above.
Room service
Not available
Common amenities
  • ○ Shampoo · conditioner
  • ○ Body soap · soap
  • ○ Face towel
  • ○ Bath towel
  • ○ Body towel · sponge
  • ○ Toothbrush set
  • ○ Comb · Brush
  • ○ Shower cap
  • ○ Hair dryer
  • ○ Shaving
  • ○ Shaving Gel/Foam
  • ○ Bath additives
  • × Yukata
  • ○ Pajamas
  • ○ Bathrobe
  • ○ Slippers
  • ○ facial cleanser
  • ○ Toner
  • ○ Lotion
  • ○ Makeup remover
  • ○ Cotton swab
  • ○ Cotton
  • ○ Clothing deodorizing spray
  • ○ Refrigerator
  • ○ Minibar
  • ○ Electric kettle
  • ○ Tea set (free)
  • ○ Television
  • ○ Safe
  • ○ Scale
  • × Trouser press
  • × Free morning edition
  • × Pay-per-view broadcast
  • × Satellite broadcasting
Facilities and Features
  • × Hot spring
  • × Rooms with open-air baths available
  • × Open-air bath
  • × Free-flowing hot spring
  • × Large public bath
  • × Private bath
  • ○ Sauna
  • × Ganbanyoku (rock bathing)
  • × Within a 5-minute walk from the station
  • × Within a 5-minute walk to the convenience store.
  • × Indoor pool
  • ○ Outdoor pool
  • ○ Pet-friendly
  • × Spa facility
  • × Fitness
  • × Free shuttle service
  • × Shuttle Service (Paid)
  • × Room service
  • × Room Service Available 24 Hours
  • ○ Barrier-free
  • × Childcare services
Outdoor pool
Available period
---
Business Hours
---
Final admission time
---
Fee(Guest)
Free
Fee(Non-guest)
---
Children's pool
None
Age restriction
Pool shape
Rectangular
Pool size
Length 15m
Width 5m
Water depth 120cm120cm
* Children who are no longer in diapers are welcome to use the facility. * Children must be accompanied by a guardian at all times. * The outdoor pool is available year-round but is not heated. * The pool can be used from sunrise to sunset.
Esthetic Massage
None
Fitness gym
None
SaunaAvailable
Hot stone spaNone
OthersCancellation Fee For Canceling the Reservation, a cancellation charge will be applied as follows based on the contract amount: 3 days prior: 20% 2 days prior: 50% 1 day prior: 80% Same day: 100% No-show: 100% (if no notice is given)

Reviews

Overall Score
4.50
Wonderful (15)
  • Rooms & Amenities
    4.47
  • Facility
    4.60
  • Hospitality & Service
    4.40
  • Meals
    4.64
  • Onsen & Bath
    4.53
  • Satisfaction
    4.40

*Reviews that have been translated from Japanese.*

*Showing only reviews from 一休.com (Japanese) and Yahoo!トラベル.*

Access Information

Address
Chiba Prefecture850 Koyaru, Yachimata City
TEL:+81-43-330-7090

【By Car】12 km (approximately 15 minutes) from the "Sakura IC" on the Higashi-Kanto Expressway
【By Train】Approximately 15 minutes by taxi from JR Sobu Main Line "Yachimata Station"

Parking Information
Fee
Free for guests
Parking time
---
Parking space
No restrictions
Number of parking spaces
105 cars available outdoor
Valet service
Unavailable

Pickup and drop-off information
Unavailable

Frequently Asked Questions

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