I believe it's only offered on a few ships. I just returned on Sunday from the Crown Princess, and they did have one, and it was wonderful, even had a small pool for adults only!
Jessie
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RCL: MOS 8/95
CCL: Destiney 10/01- Wedding/Honeymoon
RCL: AOS 10/06
CCL: Celebration 5/07
Crown Princess 10/07
The newest Princess grand class ships have this feature, and the Caribbean Princess will also have the Sanctuary when it comes out of dry dock next spring.
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__________________________________________________ _________ Coming Up:
08/02/2012 ~ Ocean Princess, Ireland & Scotland~~ 07/29/2013 ~ Royal Princess ~ Grand Mediterranean