Visting Hong Kong what will I require? Japanese Passport, Canadian PR

Hi,

I'm hoping to visit my girlfriend who lives in Hong Kong, I hold a Japanese Passport and Canadian PR Card. What will I require to enter HK?

Also, I'm planning to buy a one-way ticket to enter and my girlfriend works for Cathay Airlines and we are planning to return to Canada together on a her discount stand by flight. Is this okay, will I need a return ticket to enter Hong Kong?

Thank you,
K Nakamura