--- aggregate all the google Places entries in your city
--- ask your local chamber of commerce (if that exists in the UK?) if they have a listing for every business in the city. Chop up and categorize
--- Using the google maps api, create bundled experiences for visitors. It's one thing to find the best restaurant. It's another to find the best restaurant next to a good theater. It's an entirely different thing to go from park to bar to historical mansion, tracing the life of Count Dead-for-a-long-time. Ask tomasien on HN about his experiences with thecityswig.com
--- write a business-owner-facing page (that is basically an API for humans) allowing them to have special deals, pushed to mobile apps. Charge business owners at least $x to avoid spam.
--- record meetings of the city council and upload them.
--- consider a discussion board. reddit style, discourse style? I don't know.
--- take inspiration (of the positive or negative variety) from my hometown: moraga.ca.us