I feel like it would be more of a hassle to go to fly from seattle to Vancouver and then catch a shuttle. Its about 3 hours from Seattle to Vancouver. Depending on how early you like to arrive for flights, driving would be faster.
I don't have any recommendations for staying up there though. As far as day parking goes, I kinda like Creekside because you get a parking garage. Your car isn't all frozen when you're done. buuut its also Creekside. not much après over there.