Relaxation!!!!!
I adore this spa - as it's a complete retreat as opposed to a beauty salon 'dressed up' as a spa. The facilities are extensive and free to use if you have treatment over 1 hour.
The setting is tranquil, and the hotel in the same grounds (Sebel hawkesbury) is inexpensive and yet lovely. I've been back annually with girlfriends and even took my husband along for a weekend!
Overall - a weekend escape or even just a long day outing to Windsor is a magical release of stress! Winter is lovely there!!! log fires, winter air and warm pools!!!