Lake Agnes is well worth a visit.

PiP: on the hiking trail to lake Agnes

When we were here, the lake is still frozen and covered with a right layer of ice.

It is recommended to read the respective trail reports so that you are aware of trail conditions , wildlife warnings and possible closures before you head out.
There are relatively few hazards on the hiking trails. The trail is well maintained and easy to walk.
However, it is still important to be aware of safety and protection from bears in Banff National Park. This includes carrying bear spray, hiking in a group, and making plenty of noise on the way up.
Banff National Park is also home to cougars.
The likelihood of a dangerous encounter with wildlife is very low, but you never know what will happen with wildlife, so it's good to be a little prepared.