To hike Saddleback Pass, exit the chateau on Lake Louise facing the lake. Walk left along the lake and you’ll come to a trailhead (before the boat dock, though you can also reach it by walking up the little trail behind the boat launching area) that leads up past a parking lot and into the mountains. This trail leads to Saddleback, which is a couple hours round-trip if you stop at the pass. You can keep going, but this is a grizzly area, so watch for signs (we turned back at the one suggesting that only groups of four or more should continue) and do carry bear spray.
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All photos taken with my Sony a6000.