ok, let's try this again...
from the allearsnet.com website...
What is the Grand Floridian Spa & Health Club and what can I find there?
The Spa & Health Club at the GF offers spectacular service at a top-of-the-line facility. Among the treatments offered are massage therapies, skin care, water therapies, soothing soaks, body treatments, hand and foot treatments, and lifestyle services. A variety of spa packages are available, including spa services for families. Membership at the health club is free to resort guests for the length of their stay. Guests from other Disney resorts can use the facilities for $12/day, based on availability. The spa is managed by Niki Bryan -- for more details, visit the Niki Bryan website HERE.
I would put the link to their website, but it is a deep link to the bottom of a page. So once again, yes, at the GF you can get a day pass to the spa and use the facilities... this is not that same as pool hopping.