We've done an Hawaiian cruise and 2 weeks on land. When staying on land we found that EVERYTHING in Hawaii starts early. Most tours are gone by 7AM and scuba divers meet at 6AM. This is done to take advantage of the cooler weather and calm winds the mornings offer. It gets pretty quiet on the water when the trade winds begin picking up. Although ship's tours are not the most desireable, they are the most logical for Hawaii.