Just got back from a two week trip in Jasper Peachland and Banff, I tried to book a site with power at Whistlers back in April, ended up with a site at Wapati (no power) it too was booked in early April. At the time I booked there were only a few sites left at Wapiti, so, what I'm saying is ... if you haven't booked a few months ahead of time, your going have to be very lucky to find a site at either campground. We were lucky Banff was the end of our trip as we were leaving Jasper (on route to BC) the Icefield highway was closed due to forest fires in the Saskatchewan Crossing and Nordegg areas. We were able to take the David Thompson highway on our homeward route today... (still working on hot spots in the area)