Safety, Hong Kong
In Kowloon, along Nathan Road, we were often accosted by people wanting to take us into their homes to sell us something. This, while we did do it once, is not a safe practice, especially not worth it for the $20 Rolex he will want to sell you.
Kowloon is a big city, with some crime, as usual, but safe enough to walk around in all night. I'm not too sure about Hong Kong island.
Hong Kong is generally considered a safe city by day or night. Policemen are very helpful, and those who speak English wear a red label under their shoulder badge. Make use of your hotel's safe-deposit boxes.
My friend was robbed in a disco in Wan Chai. He suspect that drug was put into his drink, all he remember is that he jumped around in the dance floor, some girls around him..... then when he wake up lying in his hotel room, with broken glasses, blue marks on nose and face, credit card and cash were lost! So, be careful not to hang around alone in Wan Chai!
Although the crime rate in Hong Kong is not sky high compared to other metropolitan cities, it is probably not safe to walk along after 11 pm in certain parts of the city. Just be sensible and you should be able to avoid most of the troubles.
Keep in your mind to always take your ID card or license or something that can prove your ID with you whenever and wherever you go out. The police in Hongkong often want to check that in the street.