HiTenOC,
It would not be unusual to have snow on the ground towards the end of the trip. Bring appropriate clothing.
There is an overflow camping site for Lake Louise.
If you are approaching banff from the East there is a Casino on the south side of the road before the Park that allows overnight parking for free.
Large vehicles are no longer permitted to go up the mountain to access Lake Louise but there is a bus that comes to the campground.
They sometimes have "high tea" at the Lodge (hotel).
There are some walking trails at Lake Louise.
Overnight parking is permitted at the Columbia Ice Fields parking lot. They do have tourist bus/tracked vehicles for travelling out to the fast receding ice fields.
Take along a bathing suit and visit one of the hot springs. My favourite is
https://hotsprings.ca/miette/It is east of Jasper on the way to Edmonton and there is a campground nearby.
I love the pool at Radium Hot springs.
Waterton is my favourite park
What is your routing?
My choice would be:
Waterton
Cranbrook
Golden
Lake Louise
Jasper
Here is a Map from freecampsites.net
https://freecampsites.net/#!Waterton,+Alberta~Cranbrook,+British+Columbia~Golden,+British+Columbia~Lake+Louise,+Alberta~Jasper,+Alberta&query=routeSearch&routeDistance=25&routeIndex=0&roundtrip=false
