This is a must-do while you are in Chivay!
If your tour group does not include a trip here, take a taxi (which may or may not be a cart on the back of a bicycle!). Take money to get in here, but not much more, as there is no place to lock your belongings there.
There are three different pools of different sizes and temperatures, but all are more than hot enough to warm you up and be completely relaxing.
You can also order alcoholic and non-alcoholic drinks to sip in the pools! For a special treat, go there in time to watch the sun set over the hills. You really are in the middle of nowhere at this point, so when it gets dark, the stars come out so brightly!