One of the main gay areas for bars and clubs is around SoHo. Propaganda is one of the bigger (if not the biggest) gay clubs. Psychic Jack is a really cool bar for earlier in the evening.

If you are there July/August/September, the W Hotel over in West Kowloon hosts a monthly rooftop pool party under the name 'Wet: Summer Series'. Very trendy and LGBT friendly - there was a very mixed crowd when I was there.

Not a gay bar, but I can't recommend enough to go for a drink at Aqua in Kowloon. It is one of my favourite bars in the world (tied with New Asia Bar in Singapore) that has an amazing view over the Hong Kong island skyline. Great place to watch the nightly light show from!

I visited HK in July 2012, so things may have changed possibly.