A couple lines offer one way Vancouver to (basically) Anchorage v. Vancouver round trip. Both options are 7 day.
The one way voyages visit College Fjord or Hubbard and cross to ~Anchorage, while the round trip voyages head back down the Inside Passage to Vancouver.
I would not be staying on in Anchorage.
Expert Cruisemates, what advice would you give on deciding between these options? I suspect the one way trip would be more expensive in the end, since it would involve two one-way airfares, one of which is from Anchorage. But this is just a guess.
What say you? (My questions have gotten so many great answers - thanks!)