Very weird as what I just got off Timatic was:

Visa required.

Visa Issuance:
- On arrival: if required, to those arriving at Haikou Meilan
or Sanya Phoenix International Airports, travelling as part

of a tourist group (5 or more people) to Hainan Province for
a max. stay of 15 days, organized by a travel agent
registererd in Hainan Province and approved by the Natonal
Tourism of China.
- On arrival: at Hangzhou International Airport, for tourist

groups of travel agencies which belong to Zhejiang Province
for a max. stay of 1 month. Fee: CNY130.-.
Additional Information:

- Note: different passport validity may be required when
applying for a visa.
- Valid visas or resident permits in expired passports are
accepted, provided holding valid passport of the same
nationality.

- Travel on a one-way ticket is accepted. However, visitors

must hold sufficient funds to cover their stay and all
documents required for their next destination.

Warning:
- Passengers not complying with the entry or transit
regulations will be deported by same or returning aircraft.