This is strange on Google Maps.
http://goo.gl/maps/Z9HvE
It probably will not last forever, so if you are reading this a year from now, it may not be there.
Those are ski trails, with the color based on rating (Black = diamond, etc)
Interesting colors! I didn't know Google Maps showed ski trails.
Neither did I; zoom in further and the red dotted lines show where the lifts are.
Yes, they do, and some even have Street View coverage.
https://maps.google.com/?ll=45.464804,-74.332412&spn=0.006494,0.009645&t=m&z=17&layer=c&cbll=45.464808,-74.332251&panoid=creEsRKvkY8BKHcZIJ1aWg&cbp=12,303.48,,0,14.62
You could have clicked on satellite. :P