I have not done that on the Fantasy . . . yet (that will change in about 20 days!
), but I have done the villa treatments on every other
DCL ship. IMO they are totally worth it, which I guess is why I keep doing them!
They are the ultimate in indulgence - private hot tub on private verandah, then a spa treatment, then relaxing on a chaise on the private verandah while eating fruit & drinking herbal tea . . . . *sigh* . . . love it!
And yes you can use the rain forest if you do a "regular" treatment also.
Hope that helps you. Though I must admit I have a mild DCL-spa addiction . . . which I realized on the Wonder this past May . . . walking through the spa and being greeted by name by every CM I passed.
Hmmm . . . maybe I spend too much time there? NAAAAAHHHHHH!!!