If you found Saturnia Hot Springs to be crowded and overly touristy, you will love the local vibe at Bagni San Filippo. This thermal spring is more like a hot spring river with cascading white limestone formations along its banks. There is a small hike to get here, but once you arrive, you can enjoy the tranquillity of the surrounding forest.
TIP: There are several different pools along the river. We hiked past the first few areas where everyone was swimming and had a beautiful little spot all to ourselves!