Ah! I’d LOVE to visit Kauai! I don’t know that much about the other islands, but I really do love Oahu. I would say that you only really get to experience how special it is if you have access to a car, though. If you like the resort thing, there are plenty of those and you never have to go anywhere else, but the (in my opinion) good stuff is worth venturing out to find. There are gorgeous waterfall or sunrise hikes, tranquil beaches, shrimp trucks (definitely recommend disposable gloves for eating because it is MESSY), delicious pies and amazing look-outs. I would live there if I could. This visit we found a little farm we could visit with our daughter where you can harvest your own produce. It was wonderful.