I believe you would like Princess or Holland America....
Something with a lot of activities onboard to keep you busy, and a nice ship you can enjoy even on the port days so you don't have to go onshore if you do not care to go.
I would look at especially the two newest Holland America ships; Eurodam and Nieuw Amsterdam.
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.