COP has a decent park if you're good with ice... I haven't been there in years because i hate it (too old to smash myself on the ice these days), but hey maybe you don't mind that kind of thing. I'm sure someone on this forum is a COP park rat and has a more current opinion.
I went to COP once last year, never again! Maybe it's not as bad mid-week, but my idea of fun isn't standing 10 mins in line for a 5 minute lift ride for 30 seconds of downhill... The park was decent but I don't see why it always gets mentioned in snowboarder magazine. I remember Blue Mountain in Ontario having a significantly better park.
For freestyle days I think it'd be much better to head to Lake Louise and ride the bottom chair, or Sunshine and ride the one that feeds the park. You'll probably get just as much park time with some actual snowboard turns before and after!