I chose a map that highlighted ATV/Jeep trails. The main attraction to this was the bold colors and relative readability of the map. The trails are highlighted in bright colors oversetting a normal road map. The different trails are divided by color and number into areas, with an easy-to-read key to the right of the map.
My first glance at this map was very quick, but in that time I had already understood the main points of it, which I think is important to good information design. Map readers want something they can look at quickly without having to analyze it, and I think this example does a great job at giving a lot of info with a short amount of time and effort.