In reply to PilkingtonD:
I did the same snowboard/climbing winter season trip in about 2004! You’re going to have an epic time.
im a bit out of date obviously but;
Banff was a party town (and a lot of fun!)
canmore was where the serious climbers were.
grotto canyon was incredibly beautiful and grotto falls is highly recommend (it’s lower grade, split into two sections by a large rear ledge and has bolts to belay off and abseil off). We did it on Christmas Day
we also had a lot of fun trying harder but less committing ice and mixed at Haffner Creek.
the bigger stuff was up the ice fields parkway but needed a car. Be sure to be switched on to avalanche risk as the lower grade stuff is often gulleys and higher risk than the harder stuff.
snowboard wise;
lake Louise was great but a fair commute to get to.
norquay is really really steep and was too hardcore for us to really get into
sunshine was amazing. Closer to Banff and a real mix. We spent a lot of time there.
any other advice I could give is probably too dated (and inappropriate {you’re going to have a good time!})
good for you for making it happen! Enjoy!