Went to Hawaii earlier this year in March. Kauai was my first stop and I arrived literally the day after north-eastern Kauai was declared a disaster area (Richard probably remembers those days, roads were flooded over). Couldn't hike the north shore...bummer!
I definitely recommend Kauai/Maui/Big Island as a vacation. If you want adventure, do a rafting expedition to the Na Pali shore of Kauai.
EDIT: If you want motivation, see my photo gallery.
http://imgur.com/a/jWvPd