Hawaii doesn't use Daylight Time; so that makes sunset “early” in summer. Being farther south than the rest of the US, Hawaii's longest days (sunrise to sunset) are shorter than the longest days in the rest of the country.
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The Terrain - Due to the islands being made of one or more volcanoes, the volcanic dust gets blown along from East to West which also helps with scattering. This also causes the sunsets to be more vivid in colour than the sunrise.
The sky is blue due to a phenomenon known as Rayleigh scattering of light. This process occurs when white light from the Sun interacts with molecules of oxygen and nitrogen in the atmosphere.
Definitely don't worry you will get a tan. Just use the sunscreen or you will have a nasty burn and miss much of your vacation! Tan between 10 and noon, at the latest, then slather up again and lay on the beach between 4 and 6 pm.