Big complex place where you can find almost anything from good food to cheap/simple food and even bad (quality) food, good people to bad people :) Day and night there is always something for you to kill time. If you drop by Melbourne for a visit, this place should be on your list.
Be aware, be smart about what you do there anytime. Don't blame because you are not prepared.
PS: Bring plenty of cash and your credit card with you.