Hiring a car at Haikou Meilan Intl Airport for a week can be a great option for travel. Hertz, the most popular car hire company for this area, offers hire cars for around £308/week on average.
The length of time you can book a car hire for is subject to the inventory of the supplier. When renting a vehicle from Haikou Meilan Intl Airport it should be possible to hire a car for a whole month if needed.