The Grand Bath

Our Grand Bath is for both men and women. It's the closest thing to a real Japanese onsen on the North American continent. Bathing suit bottoms are required at all times. Reservations not necessary. Children are welcome but:

  • all children are full price in communal hot tubs
  • no children in diapers or of diaper age in communal hot tubs
  • no charge for children under 4 feet in any private tub (2 kids maximum per adult)  
  • during busy times (generally weekends and holidays--call to confirm) Shin Kobuta will be reserved as a communal tub for adults only (no children under 4 feet allowed)

If you prefer to bathe without a suit, we suggest a private bath or the women's communal tub.


  • Giant outdoor tile hot tub (105-107 degrees F.)
  • Large wet/dry sauna (175-185 degrees F.)
  • Expansive sunning decks
  • Cold plunge 55-60 degrees F. 
  • Cold shower
  • new! Stronger jets


Spa opening until spa closing - see hours for schedule.


$28 per person/unlimited time

Related Info

'I now have a second home here and credit a lot of that decision to Ten Thousand Waves!'