Bagno Vignoni city is a huge thermal pool, but you can’t jump in there! Try the Parco dei Mulini for a free bath just steps away!
more: http://www.albergoleterme.it/en/the-spa-pools.html (private)
Bagni di San Filippo
See our previous post roadway to heaven.
There are many other Tuscan hor springs, among all we use also to go to
Chianciano, terme sensoriali
They are only something more of 30 minutes by our villas and farm of il Fontanaro.
Here is they official site http://www.termesensoriali.it/GB/Home
Sometimes they organize nice events.