Hongkong Tourist

Hello ! It will be my first time to visit Hong Kong and I'll stay there for only 7 days.
I am from the Philippines.
I understand that I may go there without a visa.
But do I still have to drop by at your Embassy?
Or do I, at least need to prepare any documents?
Am I going to present any documents upon arrival at HK Int'l airport?
Like a roundtip ticket perhaps? what else?

And another thing, from Hong Kong, my sister and her family will visit Singapore.
What are the documents they need to prepare?
Their route is like this:
Manila- Hongkong - Singapore- Manila

Please answer. Thank you! :)