Laax has many centers that provide spa services. There are whirlpools, about three dozen baths and saunas. So it's safe to say that among the Swiss spa resorts, Laax, Flims and Falera are considered "pros".
The best spa in the Alpine Arena, which includes Laax, is located in the five-star Park Hotel Waldhaus in Flims. There's a variety of saunas and baths, spas (including spa suites), a beauty center, several pools with whirlpools and cascades, massages, wraps, and more. There are high-end spa services at the Fidazer Hotel, in the same Flims.
On average, a mud and seaweed wrap will cost you CHF 70 for 25 minutes. A professional masseur charges CHF 70-180.
The Laaxerhof, located in the Laax-Mursetch district, has a good sauna.