Re: Hong Kong
If you get a typhoon there will be waves! Of course, surfing in 120km/h winds might be a bit hard; but for a few days before/after it should be fun. Assuming you can avoid all the junk in the ocean.
If you are there for a while you can try to get out to Tai Long Wan in Sai Kung (Tai Long Wan means 'big wave bay' as well, but its a different big wave bay). You can't drive in however, so with a board you need to take a boat (which won't go out if the swell is too big eg typhoon) (unless you want to hike for about 90min - I think you can hire boards there but not sure). I used to go here a fair bit, hiking not surfing, and never saw anything over about 1ft wave. So its certainly not consistent.
Everywhere is pretty busy as you can imagine. Its still quite an expat sport, so the majority of people are from overseas trying to get a surfing fix (lots of Aussies and NZers); but the younger local (chinese) population were starting to get into it more when I was there (a few years ago), although most were at beginner level. Swimming isnt a big thing in HK, so to be honest even the beginners were worse than you would normally expect a beginner to be. But having fun, you just have to be the one who stays out of the way, not expect them to.