If you visit Lake Louise, you must allow several hours to do some serious hiking, or you miss the most magnificent part of Lake Louise. Don't just stand on the lakefront - get out and hike. This review is based on middle and late June trail conditions. August would be most ideal for all trails.
Lake Agnes Hike - most worthwhile hike. Allow a few hours roundtrip. It's all uphill, and it's exhausting, but very rewarding. Mid June can still have ice/snow/mud, though much nicer trail by late June. At a switchback you are at the right elevation to see the beautiful glacial coloring in the lake. Bring money for snacks at the Lake Agnes tea house (cash only accepted). Lake Agnes is beautiful with some ice still on the lake in June.
Fairview Lookout - not that exciting of a hike, but nice view of the hotel from the end of the trail. Do this late afternoon/early evening for the best sunlight on the hotel for your pictures. Allow about an hour roundtrip.
Lakefront Trail - good for those who can't handle uphill hikes, or if the weather isn't ideal. You can take the trail as far back as you like, even at night. Beautiful view of the hotel from the back of the lake. You can continue to the Plain of Six Glaciers from there (which I have not done yet).
Little Beehive - further uphill from Lake Agnes, if you have time. Affords nice views with an easier trail than the Big Beehive.
Big Beehive - In late June, it's possible but be sure you have hiking poles and hiking boots/shoes with good tread. The snow, ice, and rocks were too hard for me to navigate though I went partway. My husband made it to the top and got some absolutely awesome pictures. He said the path down to Mirror Lake was easier than the switchbacks behind Lake Agnes. I'm told from hiking guides that getting to Big Beehive from the Mirror Lake path is more advisable in June.
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