The appeal is that the cruise ship itself is a destination (with music, comedy, dining, spas, physical activity, etc.) and that makes a number of stops at other

The appeal is that the cruise ship itself is a destination (with music, comedy, dining, spas, physical activity, etc.) and that makes a number of stops at other destinations, each with their own character and activities. When you add in the included "kids club" on most cruises and the fact that there are always some included food available at all hours, it makes for an easy family vacation with (potentially) lots of variety. Certainly, there are downsides, I'm just addressing your question about what "the point" is...