This is the best spa I've been to in North America, hands down. The environment is beautiful, the details are well thought out, and the service is great. The massage itself is decent, not the best, but definitely not poor either. Massages are a bit more subjective, so this may be more of a preference thing than anything else.
If you're going, definitely arrive at least an hour in advance to enjoy the snacks, teas, and amenities provided by the spa.
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