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People who get off the ship and spend their time pointlessly walking around looking like a flightless dodo bird do not see and experience Hawaii. PERIOD. The shore excursions that the cruise ships offer tend to be mass-transit-oriented tours that move at the slowest pace of the oldest person in your group of 70. Get away from that crowd and make the most of your time in the islands!
There are seven inhabited islands in the Hawaiian chain and seven days of cruising. that means you get to spend one day on each island, right? Well, not exactly. Some of the islands don't have ports that can handle cruise ships at all (Niihau, Molokai, and Lanai). You'll be spending your cruise vacation on Oahu, Maui, Kauai, and the Big Island.
The rest of the ports of call have docking facilities. Kahului (Maui), Honolulu (Oahu), Hilo (Big Island) and Nawiliwili (Kauai). This is really the best situation. the ship pulls right up and docks it doesn't take long at all to walk onto shore no matter how many people are waiting for the doors to open. It makes it a lot easier to plan your shore excursions and schedule pickups shortly after the stated arrival time for your ship.