Wow, great minds think alike! We are doing 14 days in July this summer, 5 nights at Honua Kai, 2 nights in Waikiki and 6 nights at Aulani.
And to answer the OP question, we loved Kauai. Just make sure you don't do Waikiki last. We went from Kauai to Waikiki last time with nothing at the...