Yoho Banff and Kootenay

[gian]

Hi,
I'm leaving for my honeymoon in two days and the trip includes multiple hikes/backpack in the parks. Some of the stops include Lake O'Hara, Mt Assiniboine, Floe lake. It looks like most of the alpine lakes have fish but I couldn't find much information and I know at those altitude a lot of the fish are pretty stunted. Any suggestion on where to focus some fly casting to connect with some nice Westslopes cutties?
Thanks
Gian