[quote"You"]We have back to back sailings on the Golden Princess. On the 4th of May we sail from Vancouver to Seattle one day cruise. On the 5th of May we sail roundtrip Seattle to Seattle. Can we stay on the ship or will have to leave and wait to reboard ?[/quote]
Since your combined itinerary will be legal under U. S. law, you probably won't have to do anything other than present your documentation for immigration inspection.