Very Partial Answer
I think I've got the gist of what's going on so maybe if I post what I have so far, it may inspire somebody else.
I have no idea about the street names on the map
Song Ideas (credit to MacGyver88 for figuring out the idea behind this)
Solving the rest
The rankings from 1 to 10 are:
"Spanish Language is actually #5"
Stack Overflow 
Amateur Radio 
Spanish Language 
Graphic Design 
Science Fiction & Fantasy 
Earth Science 
Thanks to Stiv, who found the details of Biology and Graphic Design.