Peyto Lake, one of our favorite ever views is one of the first stops on the Ice Field Parkway. The lake gets its vibrant color from rock flour carried downstream from the Peyto Glacier. We've seen it in winter and summer and they're both equally stunning.
You can easily access the viewing platform (first viewpoint) with a 15-20 minute walk from the parking lot. There is a little bit of incline but is an easy walk for almost everyone. The viewing platform is quite small so we recommend visiting early in the morning or late in the evening to avoid the crowds so you can enjoy this incredible view in peace. There is also a Peyto Lake Panorama View Trail you can take which adds an additional 20 minutes (both ways) from the first viewpoint. You will be able to get two additional Lookouts from this trail and it will be a little less crowded than on the platform.
Also little tip, there is a second parking lot which is usually not open for visitors but can be used for disabled people or even later on when tours end for quick access to the lake viewpoint.
The viewing platform and trail are also open in winter, but depending on the snow levels, you will need to have snowshoes or micro spikes. It can get quite icy as well so appropriate gear is recommend to avoid slipping and hurting yourself.