Tamina Therme is a great choice after skiing nearby, like at Pizol or Flumserberg. Or perhaps if you are driving back to Zurich from resorts like Davos/Klosters, Flims/Laax or Lenzerheide.
It's a beautiful space with a mix of indoor/outdoor heated pools with massage jets. We particularly like the hot/cold pools for your feet. One steam room is included with your pool entrance, entrance to full sauna facilities is extra.
You can buy a 2 hour or day pass for just the thermal baths or with access to all the sauna rooms. Prices are less on weekdays. Children are allowed from 3 years old.