Lake O'Hara : Detailed information has been provided on the TripAdvisor Inside Page entitled Inside Banff National Park : Off the beaten path.  This may surprise the reader of this page, since Lake O'Hara is in Yoho National Park, British Columbia and not in Banff National Park, Alberta.  Since the TripAdvisor Inside Pages lack a Canadian Rockies section, however, the Inside Banff National Park section is serving the purpose of a de facto Canadian Rockies section that encompasses some destinations outside of Banff National Park.