I drew the map by hand from in game photos of my park, ran it through a simple art program to ad the text, saved as a j-peg in my custom photo game files and loaded onto a billboard. Took me a week to draw the park, scan it, and do the coloring of the trees and label everything. Getting the park ready for 2018 so I'll have to update the map with a ton of stuff. Hope that helps.

how does this work , how can you make one?

Looks great!