Hainan Island has officially declared itself an international tourist destination.
Being the only Chinese tropical island, Hainan is very popular with domestic tourists and Russian tourists, particularly during winter months.
When I was in Hainan in January, I was really surprised to see hordes of Russians in Sanya. Everything was geared towards the Russians, For the first time, I saw signboards written in Russian.
That's why accommodation in Hainan is becoming increasingly hard to find.
My advice is to book your accommodation or you might be forced to stay in tents (not free) during peak periods!