Hiking Trail_Banff

Easy one:

Bow River / Hoodoos

4.2 km one way; 60 m elevation gain; 3 hour round trip 
Trailhead: Surprise Corner parking lot on Buffalo Street. 

Though it is close to the Banff townsite, you will feel like you are far away as you explore this forest and meadow trail. Keep an eye out for elk and birds of prey as you climb from the river’s edge to the Hoodoos viewpoint.

Moderate one:

Castle Lookout

Moderate: 3.7 km one way; 520 m elevation gain; 3 to 4 hour round trip

Trailhead: 5 km west of Castle Junction on the Bow Valley Parkway (Highway 1A).

In the mid-20th Century, Banff erected numerous fire towers where spotters could detect flames from afar. The Castle Lookout tower has long since been removed, but the expansive views of the middle Bow Valley remain. 

Reference Link