For ages 6 and above a trip to Spa LaQua in Tokyo Dome is a fun outing to experience Japanese onsen. The Spa LaQua at Tokyo Dome is a real natural spring water that is sourced from 1,700 meters under Tokyo Dome City. The Tokyo Dome spring water is best known for is “slimming sping” and “beauty spring” which is said to increase your metabolism and rejuvenate your skin. Don’t quite know about that, but it sure did feel relaxing. It is a great place for a “Tokyo Mommy and Me Day” if 
you have a tween or teen girl or “Ladies Spa Day,” enjoy a facial, nails and hair after enjoying lunch and the onsens. If your child is under age 6, I recommend the Oedo Onsen Monogatari in Odaiba instead which is baby friendly. If you are looking for spa treatments with no onsen, we recommend Atelier Sabon in Nakameguro.
Other Tokyo onsens we love:
Keio Takaosan Onsen (Mt. Takao, Tokyo)
Tsurutsuru Onsen (Hinode, Tokyo)
Spa LaQua, Tokyo Dome – Tokyo Onsen and Spa for Families with Age 6+
Here is a handy English map of the facility to get an overview. When you pay to enter Spa LaQua, you will be given an outfit. There are six types of onsens, a steam room, sauna and body scrub are in both the men’s and women’s sections. From cold baths to high oxygen. Each section has an outside bath are on the roof. After relaxing in the onsen for a while, you can wear the leisure clothes (a public Pajama set) to the cafe or restaurants in with the SpaQ Land facility. The family-friendly areas are on the 5th, 6th, and 7th floor, and there is an above 18 area with saunas, pools and a sunning deck. The adult, only area, is an extra fee of about 900 JPY (on top of the general admission fee).
The fee structure at Spa LaQua is set to benefit people who visit M-F between 11:00 – 18:00 (kids are not allowed after 18:00). Weekends and national holidays ensure additional costs (see below). Body massages and scrubs run between 5,000 – 10,000 JPY for 30-60 depending on type (see the menu here). Head massages and hair continuing treatments run about 5,000 – 9,000 and nails 4,000 – 6,000. You can have an all-day spa day between 11:00 – 18:00 for under 30,000 JPY for onsen, hair, massage, nails and light lunch.
All the charges that you incur are charges to a bracelet you are given at the entry. When you leave your charges are calculated, and you can settle your bill. There are also onsite massage, hair, facial and nail services that you can enjoy.
If you are not with little ones, you can relax in the lounge area to take a nap in very comfortable relaxing chairs that recline 
almost to bed level. The main lounge is coed, but there is a smaller one that is just for women. It seems that there are many people who spend the entire day bathing, eating, and napping – could be a good life.
Cobine a visit to one of the following activities at and near Tokyo Dome for a full day of fun!
Tokyo Dome Roller Skating, Tokyo Dome Amusement Park, Koishikawa Park and for Families with Babies and Toddlers Asobono Playcenter
Spa LaQua Details
Address: Tokyo Dome City, La Que 5F-9F, Kasuga 1-1-1, Bunkyo-ku, Tokyo
Phone: 03-3817-4173
Hours: 11:00 – 9:00 (it is open all night); closes from 9:00 – 11:00 for cleaning (Children only allowed 11:00 – 18:00)
Cost: Adults (18 and above) 2,850 JPY, Children 6-17 2,052 JPY; add 324 JPY per person for weekends and national holidays; Late night charge add+ 1,944 JPY and Healing Baden (above 18)+ 864 yen.
Website: https://www.laqua.jp/en/spa.html
Access: There is public parking under Tokyo Dome (get your ticket validated for a few hours free); 5 min walk from Suidobashi Station on the JR Chuo-Soba, or Mita Line. 10 minute walk from Korakuen Station on the Marunouchi or Namboku Lines, 8 mins walk from Kasuga Station on the Oedo Line.
Note: No bathing suits or tattoos allowed; Kids under 6 not allowed. Strict no phone and no photo enforced
Spa LaQua Tokyo Dome – Onsen and Spa for Families with Age 6+
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