Cecilia Zambelli
Google
Big hot springs with naturally hot ocean water. There are four pools: one small one very cold, one at an average temperature, and two warmer ones (38-39 degrees I heard).
A bit pricey, but very good experience. Good changing rooms, showers with shower gel-shampoo-conditioner available (and also body lotion), and sinks to wash swimsuits.
There is an indoor area in case you do not want to pay for the pools and just sit down at the bar area.
The bar is also accessible directly from the hot swimming pool.
Quite a lot of people, but the pools are bog enough that it did not feel crowded.
Amazing location out of the town and with view directly on the ocean.
Recommended!