A puzzle within a puzzle.
A few years ago, this used to be a nice wooded area, and actually classified as a park. It didn't have any play equipment or anything. It was basically just a green space.
Recently, the city dug it out a bit and made it into the local mosquito factory.
Since the city did a bit of a switcheroo, to solve this puzzle, just switch around the last three digits in the north and west coordinates.
I don't think it will make the mosquitoes go away, but you should be able to find the cache.