Not everyone who has a PCA has the option of taking their PCA on vacation with them.
My mother's PCA has 2 other jobs beside helping her, and also goes to school. She cannot travel with them. When my parents travel, I must go with them to provide my mother's care. If I were not available, and they could not find someone else to help them, they would not be able to go. My father is 84 and unable to provide the care my mother requires.
I think being able to find reliable, friendly PCAs who are interested in short term work in return for a paid cruise is a wonderful idea. There is no reason that the PCA and the PWD cannot be a full part of all the activities.