Below meilan airport in Haikou is high-speed railway station (Meilan Station). You can take the high-speed train to Sanya (Yalong Bay Station) at the airport and get off quickly for more than an hour. If you take a taxi, you can do it. There is no departure time for taxis. You can wait until the bus is full, or you can charter a car directly, but it takes about 3 hours to take a taxi (depending on the speed, it is not safe to drive fast).