Haven't been to the world passport resorts, but I have been to the Cayman Islands....once in 1979 before it was built up to what it is now, once on a cruise and once for a week's stay back in 1998.
The Caymans are beautiful....and can be expensive. Gosh, knowing what a deal we got back in '79 makes it all the more harder to take now! We had a charter flight plus 7 nights at the Holiday Inn which at the time was THE big hotel...for something like $379! Now, it costs that much per night in some places.
Anyway, I still think it's a beautiful place and if you don't mind spending a bit more for things, you won't be disappointed.
Deb