Just got back from our every other year trip to Kauai and have some random observations.
1). Find your favorite Time Machine and go back a few years to get a Hawaii time share. High price but still much cheaper than hotel rates
2) On this trip we watched a number of ships come in for the day. They arrived late and left early. This is an island to savor and rushing around on a bus is not that. With their schedules they missed the totally magnificent sunset Napali cruises. As with many cruise stops, you just can not see Kauai by just getting off the ship and walking to the few local shops. There are two luau's worth doing and generally, ship is gone when they start.
3) In my mind a cruise is a great way to see Hawaii the first time, but you sure miss a lot by not doing land stays. As I said above you will only touch on what there is to offer.
4) Do not plan on "seeing" Hawaii by flying between islands. You check out of one hotel in the morning, take an hour to get to airport plus need to get there an hour early, fly to next island takes less than an hour, then getting from the airport to next hotel is at least another hour to wait for your room to be ready. You just spent well over a half day and the days are really short because they are far south. Change islands more than once and a huge part of your time is involved in travel.
5) Food costs are HIGH and there are little options to help on that. Even at today's prices we can eat in Dallas for under $30 for couple, all inclusive. You are lucky to get a meal for one person at that price. Twenty dollar hamburgers were the standard fare.
6). If you enjoy the hassle of a big city, Honolulu will feel right at home, but with a great view. In my daydream world I would spend my last years in a high rise condo in Waikiki. Spend all my time watching the ocean and having a car service to get my needs. Never leave the condo. Of course I need to win the lottery to make this work.
7) I love cruising and I love Hawaii. They are just two different activities. Do the cruise to enjoy life on-board and to just taste the grease things on the islands. Do Hawaii to sit back and relax.
😎 Pictures taken from my hotel room.