You might want to look at my article "Riding High on Hawai'i." It is mostly about the Waimea district where my wife's family lives. I haven't quite finished the article yet, but there is plenty of info of interest to bike riders, self-support touring or not. If you have any questions just ask. I have been visiting there for over forty years. Hawai'i, the Big Island, is a wonderful place to ride. You'll need both heavy duty sun screen and heavy duty rain gear.
http://bicyclelife.topicwise.com/doc...c_id=9282&v=8L