The crappiest looking places are the best places to eat...
I\'m talking street vendors, street restaurants, kitchen right next to the seats, people barefoot, etc...
If you\'re into karaoke, clubs offer specials with all you can eat, drink (includes alcohol), sing for a whole night, all for about HK$90, which is about US$13.
And take public transportation as its one of the best in the world...
Get an Octopus Card for many basic needs...
http://en.wikipedia.org/wiki/Octopus_card