TRAVEL ENQUIRY in Guangzhou

HI,i would like get advice on
1) zhanjiang to haikou and sanya what is the best way,short time arrive and cheapest.
2) zhanjiang train stain to haikou stain by taxi estimated how much ? or have any car pool?
3) Do sanya have skydive and flyboard activities?
4) If i take bus from guangzhou to sanya estimate 12 hours it that possible to arrive early like around 10hours?