True sidecountry aka backcountry? I know you do the bc riding thing, but your description kind of sounds like you are looking for inbounds steeps.
Revelstoke, Kicking Horse, Whistler, all have backcountry access gates. Some of them have real tours out those gates and quick back to the resort laps, maybe with some hiking. I'd message chupacabra. I am just going from what I've seen, he's been there done that. We got some other Canadians who know the in and outs of the backcountry around some of the major Candian ski areas. I am just forgetting who they are atm. Sorry guys...