If you want to see a number of different islands in a short time from the comfort of a mobile hotel don't hesitate, especially as the realistic option is a number of inter-island flights and the time this takes out of your holiday.
We're a married couple from the UK in our late 40's and have cruised with several different lines in a number of different parts of the world. Essentially we look to use the ship as a floating hotel to visit different places, so the port intensity and quality of stops is of far more importance to us than the ship.
We flew out via a couple of great days in Vancouver -- having experienced the unpleasantness of US immigration on previous trips, clearing immigration before reaching America in Vancouver was a pleasure with friendly border staff and a reasonable flight.