It seems that the island has mysterious properties with regards to the sun. It is always either midday or night on the island. Perfect for eliminating glare and shadows for a camera crew, hmm. . . Well there's also a third option for when its overcast and pouring rain and you can't tell what time of day it is, but still. Even with the time skips, the people have yet to experience a skip to the morning or evening.
Now I haven't been to Hawaii, but I'm pretty sure the sun just doesn't jump to the middle of the sky and stay there until it disappears at night. Do you think there is some reason within the continuity of the show for this or is it purely to achieve optimal photography settings?