The southeastern corner of BC (it isn't central but it is only 6 hours from Edmonton) has some pretty nice random camping. Miles of quadding and stream fishing. Just have to check on closures for the quad. From Highway #3 south to the American border and north to Kananaskis.
there is a good website for camping sites in Alberta - www.[B]albertawow[/B].com gives good info on alot of sites around the province, just be sure to check with the SRD before heading out on the quad for trail closures and welcome to S&M.