We are beginning to research for our Alaskan Cruise - not until Summer 2019. What are the "must see" ports? What is meant by 'inside passage'? Is Glacier Bay a 'must see'? We've noticed not all cruise lines go to Glacier Bay. We were considering DCL, but the prices are crazy and we've actually had MUCH BETTER food on other cruise lines. We are considering Holland America, RCI, Norwegian, Celebrity . . . Just not sure what to look for in deciding on an Itinerary.