We did the 14 day version last November. If Cartagena is on your itinerary, be very careful in that city.
This is one place where you do not want to roam around on your. In the center of the city there are military and police with machine guns on every corner. As you get away from the center of the city, the military and cops are no where to be found.
Make sure you do a tour with Princess or a private tour operator. I would not trust a cab driver to give you a tour.
We did a city tour which was a disaster. We stopped three times for a shopping break. The first stop was about 15 minutes into the tour. It was the tour guide daughter's shop.
This was the worst port stop on the itinerary.
The best stop for us was San Juan del Sur, Nicaragua where we took a countryside horseback ride.
SS Norway (12 times) '85 - '97; Radiance OS 06/01; Island Princess 11/04, Grand Princess 11/04/05, Golden Princess 7/21/06, Golden Princess 2/24/07, Explorer of the Seas 12/23/07, Island Princess 11/15/08