A really fun way to experience Kauai. We took Jonathan and Miriam's recommendations about reserving campsites in advance which made the trip easy and fun. They threw in a boogie board which was fantastic.
We also stayed one night on the south side knowing that we were going to be there for an early snorkel expedition - given traffic between the south and east it's good to camp on the side of the island you need to be on.
My only suggestion is to bring your own headlamp batteries and a handheld broom, and that I would have valued a quick text chat the day before we arrived just to remind us of the drill and to help us gauge how many extra blankets we might need to bring (the answer would have been zero, in February!).
Overall I recommend this.