cruise ship stop over for 7 hours

Dear sir,
we booked royal carrebeen cruise this november 23. hong kong to singapore...
on the way this ship stop over at sanya port PRC...only 7 hours.. for enter sanya do we require visa? if required what are the documents required for it? if required what is the cost for trasit G type? we dont have flight tickets from there..because we coming in ship..also we dont required hotel booking..please reply..ship booking attached here..