It's a really big leisure centre, run by the Comu (council) and it has some really good facilities including a big swimming pool, a children's pool, gym, sauna, steam room, squash courts and a climbing wall. There are a few more details and prices here: Pas de la Casa leisure centre
Yes there is one exterior jacuzzi on the outdoor terrace at the sports centre in Pas, just a small one for up to 4 people.
Alternatively, there are two other large spas in Andorra with bigger outdoor areas where you can relax in the warm water outdoors (amazing if it is snowing!), the closest is the Sport Wellness Spa, this is a beautiful modern spa located in the next village of Soldeu. The other would be the well known Caldea spa which is situated in the capital Andorra la Vella, Caldea has a very large outdoor area. Both can be reached by bus from Pas de la Casa.
The maximum number of attachments: 10
Maximum file size: 1 MB
Allowed extensions: bmp, gif, jpeg, jpg, pdf, png, txt, zip