First of all, you should pay attention to three points when going to Hainan for free travel.
First, air tickets must be booked in advance, and round-trip team tickets are cheap.
Second, it will be cheaper for hotels to book with local travel companies in Hainan.
Third, you can determine a general itinerary first, and then decide the next itinerary according to your own play.
I have to do more homework. If you don't understand anything, you can ask me or visit my space.
I recommend several routes, one day in Nanshan and Tianya Haijiao, one day in Nantian Hot Springs and Wuzhizhou, one day in tropical rain forest and one day in Longzai Bay.
Wish you a happy holiday.