There is a "SkyTrain" that goes directly from the airport, as well as from the area around the airport, to the Waterfront station very close to the Canada Place dock complex where the Wonder docks. Since we are arriving late Sunday PM (it will feel later as we are East Coast'ers), we will be staying near YVR that evening.
One can't board the ship until Noon'ish usually, so there will be plenty of time that morning for us to visit a convenience store ("London Drugs" is the CVS/WalGreens of Canada it appears), get our Transit passes, and then take the train to Waterfront (there are actually two separate "Waterfront" stations for two SkyTrain routes, but they are right near each other). There is a lovely YouTube that shows "how to walk from the Waterfront train stop to Canada Place," that closes with a delightful reveal of the
DCL Wonder that we will all come to love very much.
After the cruise, we will be spending a couple of nights at hotel in Downtown and then flying off on Wednesday am.