Bachelorette Dinner in SF?
This is a really difficult question, even with your qualifications. It is hard to imagine what you'd think of as a cool place without some more information as to what you find cool...
Laiola is where I would think to send you first.
are all also probably good bets.
Can you provide some additional info - do you all live in the city? If not, coming from where? Looking for dinner, "neat place", or action? Will you be staying in the city or returning elsewhere? Do you like to drink? If so, wine or booze? All of these should be taken into consideration when making a recommendation.