What are the requirements needed for me and my american friend?

Hi, I and my american friend are visiting to Hong Kong this coming Sept. 19, we already have the plane ticket and hotel voucher. We will be meeting in Hong Kong Airport and staying in the country for 14 days for vacation. We already met twice in Philippines and it will be our first time to go to Hong Kong. What are the documents needed for both of us?Do we need our conversations and pictures printed and etc?