Interview Question: If you had to build a WiFi network in Central Park, how would you go about doing it?

I was on a job interview today and was asked this question. It kind of threw me back because I had never thought about something that scale before.

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Without going into a long drawn out several paragraph explanation...how would you have answered this question with just a few broad stroke sentences?

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Edit: Minus the smartass comments plz :P (I know it's hard...that's what she said) 2nd Edit: Maybe forget the fact that it's Central Park, replace that with a very large area the size of Central Park.