Remember that Hawaii's temperatures stay between 70 and 85 degrees F year-round. Rain consistently falls between November and April. However, it's often localized to one side or a portion of any given island.
Bring a few swimsuits, as they'll surely get their use. Also include shorts, tank tops, short-sleeved shirts, sundresses, thongs, sandals and a hat.
Take a snorkel and mask to catch some of Hawaii's underwater splendor. Diving equipment, as well as most water sport gear, can be rented.
Pack according to your intended nighttime pursuits. Shorts and T-shirts are the standard dress code, but some of Hawaii's more acclaimed restaurants prefer women in simple dresses and men in khaki-like slacks and button-down shirts.
Take long pants and plenty of layering pieces if you plan to summit the volcanoes, because temperatures at the peaks can drop into the 30s. Consider garments made of fleece or breathable nylon, as well as those with water-wicking properties.
Pack your sunblock and sunglasses, because the sun's rays are intense here. Bring body lotion to hydrate your skin after sun exposure.
