THE guide
The book is recognized as the definitive guide to the big island outside (and inside) of the resort bubble. Written by a local with exhaustive personal research. And the app does what too few other apps of books of any kind do, namely take advantage of the format to cross-reference and use your tablets or phones locating capability (note, iPads without wireless data do not have GPS). There is no substitute for this app other than the book.
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Big Island Revealed 7th Edition