What should I pack for Honolulu?

Reef-safe sunscreen tops the list for a reason most first-timers miss. Hawaii's Act 104 banned the sale of sunscreens containing oxybenzone and octinoxate starting January 1, 2021. Bring your own from the mainland. A 6-oz bottle of Banana Boat Simply Protect runs about $9 at a Target in Phoenix. The same size at the Longs Drugs on Kalakaua Avenue in Waikiki tends to cost $18-22. You'll burn through a bottle every 3-4 days if you're spending time at Hanauma Bay or snorkeling off Kailua Beach. A rash guard does double duty here. It cuts sunscreen use in half and protects against the fine coral scrapes you'll pick up at Shark's Cove on the North Shore. The UV index in Honolulu sits between 11 and 13 from May through September. At that level, unprotected skin can burn in under 15 minutes. Your mainland sunscreen routine won't cut it.

Footwear trips up nearly every Honolulu newcomer. You need three pairs, and they're all different. Rubber-soled water shoes handle the volcanic rock entry at Lanikai Beach and the sea-urchin territory around Shark's Cove. Flip-flops (locals call them slippahs) work for Waikiki sidewalks and casual restaurants along Kapahulu Avenue. And you'll want one pair of closed-toe walking shoes for Diamond Head's 0.8-mile summit trail, which has uneven concrete steps from 1908 that get slick when wet. Pearl Harbor's USS Arizona Memorial has a dress code that surprises people. No swimwear, no bare feet. The National Park Service requires shirts with sleeves and closed-toe shoes. If you show up in a bikini top and flip-flops after a morning at Ala Moana Beach Park, you'll be turned away at the visitor center. There's nowhere nearby to buy replacement clothes.

Honolulu's daily temperature barely moves. Expect 24-30°C year-round, with trade winds that make the air feel cooler than the thermometer reads. The humidity currently sits around 75%. Pack 3-4 moisture-wicking shirts and one light long-sleeve layer for the aggressive air conditioning inside Ala Moana Center and the Royal Hawaiian Center. That temperature gap between outdoors and indoors is real. You'll walk out of a 20°C restaurant into 29°C afternoon heat on Kalakaua Avenue. A packable rain shell earns its weight on the windward side. Ko'olau Range showers roll through Kailua and Kaneohe 200+ days per year, even when Waikiki is bone-dry and cloudless. These are warm, brief squalls, not cold rain. The shell is for keeping your phone dry, not staying warm. Leave the umbrella. It'll invert in the trade winds within 10 minutes.

Skip packing certain items entirely. Mosquito repellent at Longs Drugs on Kuhio Avenue costs $6-8, half what you'd pay at a mainland REI. Aloe vera gel is $5 at any ABC Store. There are over 30 ABC Store locations along Waikiki's 2-mile strip alone. They stock reef-safe sunscreen, cheap snorkels ($12-18), beach towels ($10), and those flimsy but functional $4 ponchos you'll want if you're hiking the Manoa Falls trail in the afternoon. Don't bother packing snorkel gear unless you have a prescription mask. Rental sets at Hanauma Bay run $20 for the day. If you're visiting from within the US, you won't need a power adapter or voltage converter. Hawaii runs on standard 120V/60Hz with Type A and B plugs.