Not that I've been there, but the more I thought about what you're interested in doing, the more I thought Kauai was the right choice (again, not that you could go wrong) for you. And, frankly, it's quickly moving up on my own to-do list. I so wish 2014 wasn't such an up-in-the-air year for me professionally; I'd love to start putting together our next big trip. We really want to do a self-guided walking tour in the UK with a few days in London tacked on. I've been to London; DH hasn't. After that, maybe Kauai. But I like to get way ahead of myself when it comes to vacation planning! 
Have a great time, GLC. I'm really excited for you!!! Be sure to give a trip report when you return.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher