This money making idea is just as effective if not, More so.
Every popular city has a 'Nightlife' -
Step 1, Simply create a website (E.g, New Yorks Nightlife)
Step 2, Add all the info, details of clubs, bars, everything you can think of.
Step 3, Once your site is up and running print of some business cards and scatter them round the city/town.. Try put some in hotels, telephone boxes.. Anywhere.
Step 4, Ring up local taxi companies, nightclubs, stripclubs, hotels. Or go into the places and tell them about your website. Sell them an advertisement spot on the front of your website.
There is so many things you can do with this (If you ranked it on google, Well the possibilities are endless).. You can setup deals with local nightclubs such as free entry before 12 with this print off coupon.
You can even affiliate with Laterooms (in the UK) and sell hotel rooms and earn that way.. Probably want to be advertising to future tourists for that though meaning you would want to rank on google..!
With a popular nightlife destination - There's several ways to generate money from this.
I have done this myself in the past and found it very successful!
Hope this helps!