My husband and I cruised the first week of February ; the weather was warm but mostly cloudy throughout - typical of their winters. Our fellow passengers were mostly retiree-aged ; Asians ( either American or Chinese-Japanese) also made up at least half the cruisers.
The cruise-ship experience was delightful - it is really the only way to fully see the main Hawaiian Islands ( and possibly select a future stay-put favorite:). We appreciated the freedom of dining when we wanted and being seated at tables for 2; we cruised with Carnival and Costa before, as well as on 2 river cruises, and we were always seated with groups - so we enjoyed the intimacy of a table for 2 this time.
An inside cabin was quite sufficient for our needs. This was an itinerary intensive cruise, so we did not spend much time in our cabin.
We rented a car in Maui and for the other islands, we took excursions with Roberts Transport. Both were excellent - well organised and easily accessible; they are used to tourists and being an American state, they are efficient and courteous. I would heartily recommend having a first look at the Hawaiian Islands from The Pride of America.