I assume it would have been an upgrade at my current fare, and the $500 "refundable onboard credit." Not exactly sure what that means.
Anyway, my cruise was great, and will probably have to wait a year at least before I book / plan my next one. I'm thinking maybe the Eastern Caribbean might be next.
2007 - Majesty of the Seas (Bahamas)
2009 - Enchantment of the Seas (Western Caribbean)
2010 - Freedom of the Seas (Western Caribbean)
2013 - Golden Princess (Alaska, roundtrip from Seattle)