Lake Minnewanka (mini-won-ka) is Banff's largest lake – stretching up to 28km long dependent on rainfall – and it develops more of a wilderness feel the further you penetrate east. The western shore, only 10km from Banff Town, is a busy hub with a boat dock, picnic area, various trailheads and a seasonal cafe (the Black Anchor). The narrated one-hour boat cruises bookable through Pursuit (banffjaspercollection.com; adult/child from $78/50) are worth it for their succinct history, jovial commentaries and 360-degree mountain views.
But for a longer, quieter contemplation of what Indigenous people called the "lake of spirits," you'll need to hike its northern shoreline. The lakeside path, starting from near the Black Anchor snack shop, extends from Stewart Canyon (an easy 90-minute stroll) to the Aylmer Pass junction (a challenging 30km day hike) and, ultimately, Ghost Lakes (two days out and back).
Kayaks and canoes are another transport option and are rentable from the boat dock. Bring your fishing rod and try to lure in one of the legendary lake trout.
The parking lot fills up quickly, so it's best to take the Roam public transit bus, which is free for boat-cruise ticket holders.