habits is fun if you like to go cougar hunting, but it sucks because it takes forever to get a drink. Anywhere is as fun as you make it really.
I'm not sure what clubs will be going off...I hate the club scene personally. Too many people pretending to be something they are not in order to pick up fake girls that think they should be entitled to an easy life because they can dress up and look slutty. You can be sure that Port will be packed, as will the other meat markets downtown like the Hotel, Bliss, Mynt etc. Probably less crowded the further you get from downtown.
Green Street could be a good time--might be far enough away from downtown to not be completely packed. If I were you, i would pick up an issue of City Weekly and just see what the different places are advertising.