Sure - HAL either 7 day cruises from Vancouver back to Vancouver or a 7 day cruise Vancouver to Skagway and then another 7 back to Vancouver.
Either get in touch with a travel agent or check out HAL's web site for ships that will be doing this route.
go to www.hollandamerica.com
click on Destinations, Alaska Cruises and then on the right hand side of the page go to Find a Cruise and check which ships will be doing the return runs. There's lots of them.