Oh, my God, Hong Kong has sky-scrapers! And there's another sky-scraper. And another. And another! Holy Jesus, Hong Kong has lots and lots of sky-scrapers!
Dude, I'm sorry to be blunt, but this isn't a documentary; this is vacation footage. If you're honestly interested in making documentaries, it requires some kind of narrative, and that narrative usually shouldn't involve a three-minute-long montage of sky-scrapers.
Instead of hours and hours of footage of skyscrapers, and freeways, and subways, and shopping malls, next time you should get hours and hours of interviews -- the interview is the centerpiece of almost all documentaries for good reason.