Confused about cruising and Canadian ETA

Hello, I am a Filipino citizen with a USA tourist visa and an ETA (Electronic Travel Authority)for Canada since I am eligible for that program. This is my situation: I am entering Vancouver by air but leaving canada by boarding Princess Cruises one-way northbound to Anchorage, Alaska and I am NOT GOING BACK TO CANADA since I will be exiting BY AIR in Anchorage, Alaska to Los Angeles, California.

Question is:

1) Do I still need a Canadian visitor visa even if I am no longer returning to Canada? Again, my cruise is a one-way cruise.

2) Will I be able to embark the cruise ship in Canada that's leaving Canada to Alaska (US) with only my US tourist visa and Canadian ETA?