We just got back from doing the POA cruise (May 14) the spending 6 nights at Aulani. The cruise was great if you look at it as a floating hotel and a great way to see different parts of the islands. Food was just so so. The buffet was generally good, but we tried two of the free restaurants and they were not good. We kind of refused to pay for the premium restaurants to get a better sit down mean. THe buffet had lots of selections and fit the bill. Breakfast buffet was great. Room was small but good. They just got new mattresses which were awesome.
We had thought about renting a car but opted to book tours through Roberts Hawaii - rshshorex.com and were very happy with them. Also much cheaper than excursions booked through the cruise directly. We did the deluxe 3 tour package - the road to Hana on Maui, Volcano Ntnl. PArk on Hawaii, and the movie tour on Kauai. Much cheaper to book as a package of three the. Individually, and the guides were all local with lots of great stories and information. We were very happy. The Road to Hana was very "interesting" and I was glad we were on a tour rather than trying to drive it. Very narrow roads, lots of curves, and beautiful scenery that you would miss if you were the driver.
At most ports there were very inexpensive trolleys that stopped at many places, or trolley tours that were reasonable. There are rental car shuttles that will pick you up at the pier too. Lots of easy options.
Also, at almost every port there is an ABC store within walking distance where you can pick up water, soda and snacks at good prices.
In Kalipacki/Lihue on Kauai there is a burger joint called the Beach Hut just a short walk from the pier with amazing burgers and shakes and a view from the upstairs seating that can't be beat. Our best meal of the cruise.
Another tip we learned too late....wait til the swap meet to get your souvenirs. Same stuff everywhere.....much cheaper there.
Any other questions, just ask