Why dont you work on Augmented Reality. There is a company called Layar which has a AR browser which runs on IPhone and Android. You can webservice which will poll your database for results and pass it on to the Layar Browser. Then people using it can see your Points of Interest in their phones when they look for it. You can also bulid a separate DBMS to configure and manage your database. This should be a unique project.
Check the following links -
http://www.layar.com/[
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Google it for more information