

One good beach setup covers most of the trip. You will use it every day and rebuild it every morning.
Packs for: a full beach day, repeated all week.

Big Beach, Mākena. Photo: Hawaii Tourism Authority (HTA)
Pack for a long day in the car with stops in the rain, not for a beach day.
Packs for: Hāna and the windward side, where it rains on a sunny day.

Hāna Highway, East Maui. Photo: Hawaii Tourism Authority (HTA)
This is where first-time visitors get caught. The summit can feel shockingly cold compared with the beach.
Bring long pants, closed shoes and layers you would normally associate with a cool fall morning. Haleakalā is above 10,000 feet and the beach forecast tells you nothing about it.
The item people most often leave behind is a real wind layer. At 10,000 feet the wind does far more to the way it feels than the temperature does, and a sweatshirt alone is not enough. A thin windproof shell weighs nothing and is the difference between watching the sunrise and sitting in the car.

Haleakalā summit at sunrise. Photo: Hawaii Tourism Authority (HTA)
Pack the things that stop a small problem becoming the whole afternoon.
Packs for: beach days, long drives and one cold morning.
Do not buy a suitcase full of Maui gear before you leave.
Most resort and condo areas have easy access to groceries, pharmacies and beach basics, so a forgotten item is an errand rather than a disaster. Snorkel gear, beach chairs, coolers and sun shirts are all available on the island, usually within a few minutes of where you are staying.
Leave expensive jewellery at home. Anything you would worry about on the sand does not belong in the bag.
Do not leave luggage or valuables visible in a parked car. That is the single most common way a Maui trip goes wrong.
Pack one genuinely warm layer even in August. Haleakalā does not care what the beach forecast says.
Bring closed-toe shoes you can get wet. The Hāna stops that are worth stopping for are the muddy ones.
Buy the bulky things on the island. Chairs, coolers and boogie boards are not worth the baggage fee.
Not for most visitors. Comfortable closed-toe walking or trail shoes cover the Hāna stops and the easy trails.
Yes, and a windproof one. At 10,000 feet the wind does more to how it feels than the temperature does.
Usually not. A light layer for air-conditioned restaurants is as far as it goes.
Only if fit matters to you or you plan to snorkel often. Rental gear is easy to find near every main beach area.
Shoes you can walk and get wet in, a light rain shell, water, snacks and a change of shirt. Assume no cell service and no card reader.
Beach chairs, coolers, boogie boards, sun shirts and any toiletry you forget. Groceries and pharmacies are close to every main resort and condo area.