Hey Danny, If your target market is your local town/city then you just gather 10 images of local places that everyone should know and create a contest application. Take the photos yourself or grab them online. Then make a contest/quiz app if you don't know how to do this find someone that does.
Post the application to your fan page then people have to like your page to enter the contest. Once they click like then they are presented with 10 photographs one by one and they have to choose from multiple choice answers (4 answers) to guess where the local photograph was taken. The prize is a personalised certificate that is generated after they have answered all ten photo questions with their score in percentage. So if they scored 50% they got half the answers right and would be classed as a 'tourist' lol. If they got 100% they would be classed as "Town/City Mayor" something like that, use your own terminology but keep it humorous.
This will go viral quickly because the certificate will be automatically posted to their wall letting all their friends know that they have just taken part in the contest/quiz along with their score. Their 'Local' facebook "friends" will all see this and some will want to take part and so they go through the contest/quiz app and a certificate gets posted to their friends wall so all their friends see it and then their friends want to take part and so on and on and on...
If your target clients are national or international then just choose major cities in each location that you want to target and gather ten photos of major landmarks there. Don't make it too easy as you will want people to compete to beat their friends score. Then you just post updates to you fanpage wall that is relevant to the town/city and every now and then include a post regarding your services, special offers etc,
A recent example of this contest/quiz app got 250,000 targeted likes in 5 days!
Hope this helps ya.