I am pretty sure you can also go to Los Angeles. Its a slightly different route but it goes.
Just be prepared to spend seven days on the ship just going around to the Hawaiian islands before four days at sea before you visit Ensenada Mexico the day before you hit Los Angeles.
In other words, if you are look for a "ferry" kind of ride directly from Hawaii to Los Angeles, the answer is "no" - there is no such thing. But there are Hawaii cruises that start in Honolulu, see Hawaii and end in Los Angeles, plus legally you have to visit at least on foreign port, and in this case Ensenada qualifies.