We are New Zealanders who are planning a trip to Shanghai in early Nov. We have 6 days booked in Hong Kong. We don't want to purchase air tickets for Shanghai until we get to Hong Kong as not sure when or how long we want to go for. To get a visa before we leave home we need to show return tickets for China. How easy is it to get a visa in Hong Kong and where would we get it. We are staying at the Grand Hyatt on Hong Kong Island.