Burke Williams may have the jacuzzi, but Amadeus outranks them (in my humble opinion) in the general quality and creativity of services. For something truly unique, I highly recommend the Rainforest Massage. This is done in a wet room under shower heads -- basically, imagine getting a full body massage during a warm summer rain. Amazing!
Great fluffy robes. Nice Eucalpytus steam room.
The Green Street location is nice, but the Paseo Colorado is better, I think, because after your spa-ing, you can relax outdoors in the courtyard or have a glass of wine next door at Bottega. Who wants to "ruin" the effects of a day spa by getting in the car right away to face traffic?