GRAND MONday Resort TOKYO BAY MAIHAMAOUTDOOR POOL Outdoor pool
GRAND MONday Resort TOKYO BAY MAIHAMA
OUTDOOR POOL
Outdoor pool
365 days of pool entertainment
Enjoyable,
Across the seasons
Resort experience
MAIHAMA LAGOON
During the day, enjoy a vibrant resort pool experience with your family or group.
Swim to your heart's content, eat, rest, and relax in the sauna. It's a place where you can spend your time however you like.
From dusk to night, you can relax and enjoy the changing gradations of the sky and the fantastical surface of the water.
In winter, enjoy a warm and cozy hot pool; here you'll find enjoyment that transcends the seasons.
Special memories are created at glamorous events and waterside entertainment.
POOL
期間限定! ご宿泊の方はデイプール無料
Limited Time Only! Daypool free for guests
Enjoy the sea breeze at our outdoor pool, which includes an adult pool with jets and a children's pool with a depth of 0.4m.
In the summer, it's a resort pool where adults and children can have a blast, and in the winter, it transforms into a relaxing hot pool with heated water, allowing you to enjoy waterside activities 365 days a year.
CABANA[Cabana]
A covered private space called a "cabana" is located poolside. It can be used as a sunshade or a place to relax.
Covered private space located poolside"CABANA" It can be used as a sunshade or resting space.
BARREL SAUNA
[Barrel sauna]
By the poolside, you'll find an authentic barrel sauna made from natural wood. Enjoy a moment of deep relaxation in a space that evokes the warmth of nature, perfect for soothing your mind and body.
POOL SIDE BBQ
In the barbecue area, you can enjoy authentic BBQ by the poolside.
During the day, enjoy a lively barbecue with family and friends, and in the evening, transform into a resort-like dinner surrounded by lights and music.
Enjoy a unique dining experience at our hotel, blending the liberating atmosphere of a resort with the joy of food and entertainment, all while gazing at the ocean, the pool, and the endless sky.
- ● Available hours
- 2.5 hours
- ● Business Hours
- 11:30〜22:00
(最終入場19:30・ラストオーダー 21:30)
*Reservations and inquiries will be announced soon.
INFORMATION
POOL AREA MAP
- place
- 1st floor outdoor
- Utilization time
-
● Day pool
8:00-17:00 (last entry 16:30)● Night pool
18:00-22:00 (last entry 21:30)
*The night pool is available to those 18 years of age and older.
- Pool
-
Pool with jacuzzi, water depth 0.6m
Adult pool, maximum depth 1.2m
Children's pool, water depth 0.4m
- poolside
- Barrel sauna (capacity 8 people): Free
BBQ area (2 tables each for 6 and 8 people)
- Usage fees
Reservations
*Reservations will begin soon. -
-
Hotel guests
6/30までの宿泊予約限定!
7/18~10/31にご宿泊の方はデイプール無料● Day pool
*Free for children under 3 years old[Monday to Thursday]
[Monday to Thursday]
Adults: 3,500 yen / Children (elementary school age and younger): 2,500 yen [Friday-Sunday/Holidays]
[Friday to Sunday and public holidays]
Adults: 4,500 yen / Children (elementary school age and younger): 3,000 yen ● Night pool
Adults: 4,000 yen *Available to users aged 18 and over. -
Day trip customers
● Day pool
*Free for children under 3 years old[Monday to Thursday]
[Monday to Thursday]
Adults: 5,000 yen / Children (elementary school age and younger): 3,500 yen [Friday-Sunday/Holidays]
[Friday to Sunday and public holidays]
Adults: 6,000 yen / Children (elementary school age and younger): 4,000 yen ● Night pool
Adults: 6,000 yen *Available to users aged 18 and over.
-
- item
-
-
● Items for sale
- Swimsuit (women) S/M/L/LL
- Swimsuit (men) S/M/L/LL
- Swim diapers for water play (for children weighing 6kg to 20kg)
- Children's arm floats
- Children's goggles
- sunscreen
- Smartphone waterproof case
-
● Rental items: Free
- Children's arm floats
- Children's life jacket
- Inflatable ring pump
● Rental items
- Travel gown (outerwear): 300 yen (fee applies)
-
• The following facilities and services are available to you.
- Free use of the large public bath and sauna.
- Free use of the large public bath and sauna.
- Barrel sauna: Free to use
- Barrel sauna (free)
- Dedicated locker
- Changing room shower
- bath towel
- Waffle gown (winter only, 300 yen)
- Re-entry possible
*For hotel guests, this is provided in your room.
Please use the towels and bath towels provided.
Click here for information about the public bath.
CABANA Cabana
Cabana is a covered private space located by the pool.
It can be used as a sunshade or rest area. Recommended for groups.
A private covered space by the pool"CABANA".
It can be used as a sunshade or rest area. Recommended for groups.
Usage fee: 5,000 yen/3 hours
- Cabanas are reserved individually.
• A separate fee is required for using the swimming pool.
Refunds are not available after you have started using the cabana.
・CABANA Reservations are made per unit.
• A separate fee is required for using the swimming pool.
・CABANA Refunds are not available after the service has been used.
Limited quantity, first come first served.
You can make a reservation by clicking the reservation button below.
If you wish to use the facility on the day, please contact our staff.
*Reservations will begin soon.
• Regarding the use of our facilities by children
- Children who are not yet potty-trained may use the pool area only during daytime hours. Please ensure they wear swim diapers.
- Children under elementary school age must be accompanied by a guardian to use the pool. Guardians must wear swimwear and enter the water with their children.
- When children under elementary school age use the facilities, please ensure that a guardian also wears a swimsuit and enters the water with them.
- The barrel sauna is not available for children under 12 years old.
- We offer free rental of arm floats (arm swim rings) for children. (Limited number available)
• Important notes regarding use
- During peak hours, we may restrict entry.
- Due to weather or safety reasons, the pool and cabanas may be closed without prior notice.
- Due to weather and safety management reasons, the pool and CABANA We may suspend operations without prior notice.
- In the event of a full-day closure, we will refund your usage fee or provide alternative arrangements. However, if restrictions on the use of the pool area are imposed only during certain hours, we will not be able to issue a refund.
- Due to weather and safety reasons, the use of inflatable rings and other play equipment may be prohibited. Please follow the instructions of the staff.
- As a courtesy to other guests, we ask that you refrain from using the pool area if you have visible tattoos (including temporary tattoos and body paint). You may only use the pool area if your tattoos are completely covered with a rash guard or similar garment.
- For safety reasons, we strictly prohibit anyone who has consumed alcohol from entering the pool. Furthermore, we reserve the right to refuse entry to anyone who is intoxicated or feeling unwell.
- For hygiene and safety reasons, bringing in food and beverages other than those intended for hydration, such as mineral water and sports drinks, is prohibited. Furthermore, to prevent injuries from breakage, bringing in glass bottles and cans is strictly prohibited.
• Regarding the use of the pool and facilities
- The adult pool has a maximum depth of 1.2m, and the children's pool has a depth of 0.4m.
- Swimsuits are not permitted inside the building or in the public baths. Please wear a top (such as a gown) at all times. Furthermore, you may not move around or enter the building in the nightwear provided in your room.
- Please note that you are not permitted to enter the restaurant in your swimwear. Please change into appropriate clothing before coming to the restaurant.
- We do not offer rentals of swimwear, goggles, rash guards, etc.
- The pool area can become very hot due to the sun. Please wear sandals in the pool area (sandals provided in your room are available for your use).
- Please be considerate when taking photos or videos, ensuring that other customers are not included in your shots.
- Guests staying at the hotel can use the pool before check-in and after check-out. If you wish to use the pool before check-in, please stop by the front desk and then proceed to the pool reception. If you wish to use the pool before check-in or after check-out, we will store your luggage at the front desk.
RESERVATION
Reservations will begin soon.
Pool reservations
- Advance online reservations are given priority. Reservations are accepted on a first-come, first-served basis.
- Same-day sales will be available only if there are spaces available.
Hotel guests
Day trip customers
Cabana Reservations
CABANA Reservations
- Advance online reservations are given priority. Reservations are accepted on a first-come, first-served basis.
- Same-day sales will be available only if there are spaces available.


