Movie location hunting can be great fun.  If you are a Dirty Harry fan then you are made up in SF (there is a great site that tells you where all the scenes were filmed - google it if interested).  Also if you are in LA / Hollywood there is a place you can visit to see the locations being used for filming that day (it can be a great waste of time). 

I also had fun driving round LA looking for places I knew from songs (I remember finding the Miracle Mile and 'Sunset & Vine').  I took this to extremes when spending some time in Flordia when I realised I was driving down "Ocean Boulevard", safe to say that the current occupents of 461 did not want to indulge me with the afformetioned web site (though they were extremely polite about it).

Of course not everyone is a geeky as me.

 

EDIT: http://dirtyharryfilminglocations.wordpress.com/