For Hawaii, pack light and beach-ready: breathable clothes (shorts, t-shirts, sundresses), swimwear, flip-flops/sandals, comfy walking shoes, sunglasses, hat, reef-safe sunscreen, light jacket for evenings, toiletries, travel documents, and a reusable water bottle; if you plan hikes or water activities, add activewear, a small backpack, and a waterproof phone pouch.