Hike this in August and by far our favourite hike! So, so gorgeous at the top (so long as it's a sunny, warm day). Better than Lake Louise in our opinion....so much more natural and less crowed.
One word of caution: Even though they advertise the bus going to the top until 3:45pm. IT DOES NOT! We got there at 2:05pm and were told we just missed the last one!!!! So make sure you get there well before 2pm!
Desperate to get to the top and feeling fit at the moment, we started hiking up the road. Almost 2 gruelling hours up a dirt road with trucks (and the very bus that wasn't supposed to be going up) passing us and leaving us in the dust. Once at the chalet at the top, it's another hour hike through the beautiful meadows to the lakes and then a couple of hours around the lakes. It was still worth it for us, but we're quite fit and even then, we were sore for a couple days afterwards.
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