Here is the link to book the cruise:

It also available through Costco if you have a membership:

The cruise is the 5-day Pacific Coastal from Los Angeles on the ship called the Norweigian Joy April 19th - 24th

leaving from Los Angeles and ends in Vancouver, we suggest looking at https://www.united.com or

 https://www.aircanada.com for flights. The aiport code for Vancouver is YVR.