There are great campgrounds at both parks. The Whistler (Jasper) and Tunnel Mountain (Banff) CG"s have full hookup sites, if that's what you're interested in. Those have to be reserved very early, like on the day that reservations start at Parks Canada. My suggestion is to familiarize yourself with the Parks website before the day that reservations are accepted. That way you can create an account and be all ready to get online early that morning. I'm not joking; the better sites go very fast.
There's lots to see and do around both parks. Be sure and visit the Columbia Ice Fields which are sort of mid-way between the two. And, of course, Lake Louise is a must see.