Similar to cruise packages in that they allow a person to explore a destination before or after a cruise, cruise tours are becoming vastly popular among cruisers. For the most part, cruise tours are available in two parts of the world: Alaska and Europe. You'll be taken via rail or motor coach to places inaccessible to cruise ships.
But, really, cruise packages can be set up no matter what destination you're in. Fly into Ensenada, Mexico before your Hawaiian cruise; spend a few days there while you're at it. Arrange hotel accommodations in Rome after your amazing Mediterranean cruise. Explore the lush forests of inland Brazil. The choices are yours, and it can all be arranged according to your time table.