Dress warm! We just returned yesterday. You will love it. If you have any questions, let me know. I had some serious issues with Budget re: our car rental in Vancouver. Other than that, no problems.
If you are driving, make sure you have gas. If there is an accident on the Sea to Sky, you could be there for a while.
There was no new snow the entire week we were there. Nothig but blue skies (and a lot of wind).
Have Fun! We did!