We have tried to provide a complete checklist of items for your trip to Hawaii. Print the pdf and pack your bags accordingly. Remember Hawaii is in the tropics. The temperatures are warm all year round. The activities you choose will likely dictate whether you dress casually or formally. Casual is the norm here. A t-shirt and slippers (flip flops) is common island wide. Upcountry be prepared for some cooler temperatures and bring warmer garments.
Enjoy your visit to Hawaii with all the things you'll need to swim, snorkel, hike, golf and just relax.