-Banff and Lake Louise, Alberta, Canada-
...this part of the world is set inside the borders of the vast Banff National Park, the area that surrounds these two towns is a Rocky Mountain wonder, a place of electric blue glacial lakes, waterfalls, abundant wildlife (from elk to bighorn sheep to grizzly bears) and breathtaking grandeur.!! You can stay either in Banff, the busy hub of the area and home to classic hotels like the Fairmont Banff Springs, or pursue some solitude up at Lake Louise, where hiking trails up into the mountains-and beautiful silence-are just steps away...
If you are not planing on going skiing, your best bet to visit this part of the world would be August until mid September. Weather will be descent (not to hot not cold), trees will change color and so on...