Is OP still around? I'm
>>1077043 and just booked into a backcountry campsite for this weekend ($20) in Kootenay. They've had a bunch of cancellations.
I'm heading up to check out a part of this trail:
http://www.summitpost.org/the-rockwall-trail/761989 It can be confusing as there's 4 national parks and several provincial parks all abutting each other but you can do any type of camping imaginable to from drive in and RV, to short walks to campsites, to backcountry campsites and even and alpine huts.
https://www.pc.gc.ca/en/pn-np/ab/banff/activ/camping?gccf=true 