I'm assuming you're starting this as a business venture. If that's true, what is your target market? Most students are either already familiar with NG or have friends that are. Most visitors to B/CS are familiar with the NG area. I cannot imagine any of these groups paying money to be lead around a 3-block bar district.
I paid to do a pub crawl while in Rome, but that was an unfamilar city with bars that are not next door to each other. If you're not providing any free alcohol at all (i.e. free shot at the door of each bar), what motivation is there to pay for this? I realize that you're not charging this time, but I'm assuming that in the future you're going to charge.
EDIT: The pub crawl in Rome also had all the beer and wine you could drink during the sign-up hour (8-9) and then you got a t-shirt and a shot when you entered each of the 4 bars. All of that was only $15.
[This message has been edited by YellAg2004 (edited 11/14/2006 5:08p).]