Buy the Hana version, not the full island
We purchased the full island version. After driving the entire island over 14 days, we would advise against purchasing the full island version. The Hana version however is very concise and I would suggest purchasing. The main issue with the full island version is different roads have different narrators and dramatically reduced content for everything beyond Hana. It sound like the company recorded the Hana version, had positive feedback, and then pieced together a bad version for the rest of the island. Not to be entirely negative, the Hana portion of the trip made this a well worthwhile portion.
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Maui GyPSy Guide Driving Tour