I have a friend who is a bar girl in Thailand. She has a friend who would hook her up with good ganja, for free. Smoked many joints with her, and hope to smoke many more in the future. Good times, great sex, no complaints.
hkm, the ganja grown in the tropics tends to be sativa dominant, meaning you won't get tired or want to chill out. Perfect for sex, partying, and other high energy activities, if you aren't too paranoid to enjoy it. Unfortunately Dutch indica dominant seeds have made their way around the world over the past few years, resulting in more weed with that boring, stoned, sleepy 'high'.
Unfortunately the average person knows almost nothing (or even worse, they believe the shit the government tells them) about drugs, especially in HK. Erowid.org is a good site for those who want to learn more.
This is a big city that's a trade hub, so anything and everything is available if you ask the right people at the right time. I have smoked good ganja and hash in HK, but it isn't easy to find, and it will be expensive.
Don't know anything about other drugs as I'm not interested. Pussy weed and alcohol is all I need to keep me