The Spa Scandinave is a beautifully urban take on the nordic and "polar bear" spas that are common around the Townships and Laurentians, where the emphasis is on being out in nature. The stunningly designed space (by Saucier + Perrot) is sombre yet peaceful, full of dark (granite?) surfaces and gently curving lines. I found the environment really added to the feeling of bliss and rejuvenation after you emerge some 3 odd hours later into the outside world.
The service is also very courteous and helpful; I organized an outing for a small group (they'll give you a discount if you book for 10 or more) and even though we all had slightly staggered arrivals, they were very accommodating.