I've just sent this thought to someone else but you may like
it as well.
To keep it brief, wifi enables you to connect to the internet
without wires from anyone broadcasting an uncoded wifi signal
in your area.
Now how about if you put together a website with games,
competitions, local news or events and included paid for
advertising for local services and businesses in your area.
You then broadcast your own wifi signal which can be picked by
anyone with wifi on their laptops or home pc's, but instead of
connecting to the net, they connect directly to your site? You
can if you like, also produce a coded prepay card which would
enable people to access the internet from your site as well! I
have web building programmes, servers and router details and
can possibly help you with furthering the idea. Feel free to
contact me.