As an AI language model, I don’t have personal preferences or the ability to rank the facilities. However, here are ten casinos that are known for their exceptional spa and wellness facilities:

1. The Venetian & The Palazzo, Las Vegas
2. Bellagio, Las Vegas
3. The Mirage, Las Vegas
4. Encore at Wynn Las Vegas
5. The Four Seasons, Las Vegas
6. MGM Grand, Las Vegas
7. ARIA Resort & Casino, Las Vegas
8. The Ritz-Carlton, Aruba
9. The Cosmopolitan of Las Vegas
10. Wynn Las Vegas