I only found two cruiselines that sail one-way to Hawaii: Carnival and RCCL, and RCCL only sails from Vancouver, B.C. Carnival sails from Vancouver and Ensenada, but only has a couple of sailings a year, as does RCCL.
The only other option besides a round-trip on Princess or Holland America would be a 7 day cruise around the Islands on NCL; you could fly over and back, enjoy a nice cruise, and spend as much time in the Islands pre- or post-cruise as your schedule allows.
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