Local drivers will take you around the tourist spots efficiently by the shortest route. Cabs can enter sightseeing spots and stores that are inaccessible by large buses.
*Except for places where all vehicles are not allowed to park.
On Hachijojima, there are places where the signs are confusing, even in tourist areas. This is part of the fun, but there are also many people who get lost. With a cab, you can reach your desired destination without getting lost.
Since it is a private tour, you will have your own private time. This is perfect for those who are not comfortable with group activities or for those who want to spend a relaxing time on the island.
You can take pictures until you are satisfied, stop by a cafe, and enjoy the hot springs to your heart's content.
Since there is no charge for gasoline, you don't have to worry even in remote islands where gasoline is expensive!