Hainan is still suitable for free travel. Just got back from Sanya, where there are many places and advertisements for booking air tickets. It is also more appropriate to make a reservation after going. It's cheaper to book a round-trip ticket from your place of departure. I booked a five-day and four-night trip home in E Long. From Shanghai to Sanya, two people are less than 4000 yuan. You can refer to it, or there are many in Sanya, such as free Internet, Sanya Star and Home Inn Network. You can compare the prices before making a decision.

In addition, it is highly recommended not to join the group. It's very tiring to join the group, so it's more comfortable to go by yourself. You can watch some Hainan travel notes on Ctrip. Many of them are comprehensive, and then you can make a trip that suits you.

Finally, I wish you a pleasant journey.