We were told if we went off the map & did the alternate route to Hana the car rental would be void--but that didn't stop us. It was SCARY; 2 way roads around mountains that only 1 car could fit; cliffs, rough roads; but the views were spectacular! Also great to stop when you wanted; definitely fill up before you go & make sure you have everything you need (water, snacks, etc.). We had fun but it could cause stress. They even sell shirts, I survived the road to hana!
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