Been here a few times, it has a great variety of thermal pools, arranged up the hillside, getting hotter as you climb up. Most pools have water jets at the side gently to massage you, some with waterfalls to stand under.
The concept is simple but effective; volcanically heated water sourced at the top of the hill, nearly boiling, is piped down the hill and mixed with cold sea-water to create the series of heated pools at various controlled temperatures, the cooler ones being larger to accomodate more people. There's also access to a sea water beach, indoor heated pools, and a restaurant.
Entry is not cheap, but the facilities are good, and good value for day's activities.
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