It takes about 3 days by bus, or more than 30 hours if it is fast.
You can go back to Xiamen by bus. A comrade-in-arms of mine used to go home by car from Sanya. At that time, the price was 240 yuan. The price is to reserve a seat with the driver. Don't buy tickets at the bus station. If you buy a ticket at the bus station, the fare will be more than 300 yuan.
When you take this bus, ask the driver for his phone number. Then, you can call him when you decide to go back. Most bus drivers in Xiamen know them. He will tell you which bus to take, and the price is cheap.
When exactly do you want the plane ticket? Make it clear, okay? Little sister. CZ3838 Haikou meilan airport, Xiamen Gaoqi Airport, China Southern Airlines 19:502 1:30320 (medium-sized passenger plane), 88% (4 minutes late), 427 yuan (3.9 fold), maybe even lower. For a self-help tour, it is better to spend more than 5000 yuan, so it will not be enough. Besides, I don't I don't know how you want to spend it.
How much is the lowest air ticket from Xiamen to Sanya? How much is the self-help tour for a week?
If there is no direct boat, you can fly from Xiamen to Guangzhou (the fare is about 770, the shortest flight time of Xiamen Airlines is 1 hour), and then take the train from Guangzhou to Haikou (the fare is about 138, the whole journey is nearly 12 hours, and the first flight takes 20 hours). Finally, you can take the train from Xiamen to Guangzhou and Guangzhou to Haikou. The following is the following. However, you should arrange the time.