The lifts close at 3 or so. You can hike the public pipe/park I guess after that but then you would have to hike allllll the way down to the base and that takes about 3 hrs at least, and of course theres bears...seriously.
'Computer games don't affect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkened rooms, munching magic pills and listening to repetitive electronic music.' -Kristian Wilson, Nintendo, Inc, 1989