Lake Peyto is a must watch if you are in and aroudn Canadian Rockey area. We travelled to Banff and Icefield Parkway from Toronto in Sep-2011. The whole area is so dreamy and fascinating. Peyto lake in particular is not as celebrated as lake louise, but trust me it was the most brilliant water color I ever saw in my life... A well-defined pathway leads you to the viewing platform. The place is much less crowded than other tourist spots in this area. All in all a must see in Rocky Mountains trip!