When we search the web for Europe Hot Springs and similar terms we get a lot of results.
We have found that many thermal baths are often visited by older people for medical reasons.
We are looking for popular (large facilities) where young couples and / or couples with small children can be found. Where patients, people who visit the thermal baths for health reasons are less represented.
It would be ideal if you could do something in the area in the evening (go out).
I am looking for popular natural hot water in Europe targeting young couples and families with small kids.