#18 Canadian Rockies Day Hikes: Lake Oesa Trail Location: Yoho National Park Trailhead: Lake O’Hara Type: Out-n-Back Rating: Moderate Total Distance: 4 miles  Trailhead Elevation: 6,625′ Total Elevation Gain: 905′ Recommended Time: 2 – 3 hours Recommended Season: Late-June to Mid-September Reservations for the Lake O’Hara bus are needed. (Otherwise add 7-miles (one-way) to hike up…