For those driving to Whistler, those who are in the know suggested a route that crosses the border at a location other than I-5, the main artery from Seattle to Vancouver, due to hour-long typical wait times on the interstate highway.
The route given in the link below should save you an hour or more at the border.
Please note that I have not driven this route personally, so I cannot attest as to its veracity. If anyone has anything to add, please send an e-mail to