The questions we actually get asked most
Do I need a passport?
For US citizens, no — Hawaiʻi is a US state. A driver's licence or other REAL ID-compliant ID is sufficient for domestic flights. International visitors need the same documents they'd need to enter any other US state: valid passport plus visa or ESTA as applicable. See our getting there guide for more.
What currency is used?
US dollars, same as the rest of the United States. No exchange needed for US visitors; international visitors should exchange currency or use ATMs before leaving the airport, since exchange rates at resort-area currency exchange counters are typically unfavourable.
Do I need a car?
On most islands, yes — see our car rental guide. The exception is an Oʻahu trip based entirely in Waikīkī, where TheBus and rideshare can substitute, though a car still makes day trips to the North Shore and windward side much easier.
Is tap water safe to drink?
Yes, throughout all the main islands. Bring a reusable bottle rather than buying plastic water bottles.
When is the best time to go?
There's no single answer — it depends on what you want to do. See our full best time to visit guide for a season-by-season breakdown by activity.
Which island should I visit first?
Oʻahu if you want the easiest logistics, widest flight options and most things to do within a manageable radius. Maui if beach resort combined with real adventure (Road to Hana, Haleakalā) is the goal. See our full islands guide for a genuine comparison.
How far in advance should I book?
Flights and accommodation: as early as possible for peak season (December–March, June–August), at least 4–8 weeks for shoulder season. Timed-entry attractions (Diamond Head, Haleakalā sunrise, Hanauma Bay): book the moment they open online, weeks to months ahead during busy periods. Car rentals: at least 4–6 weeks ahead in peak season.
Is Hawaiʻi safe?
Generally yes — the main risks specific to Hawaiʻi are ocean-related (rip currents, shore break, flash flooding near waterfalls) and altitude-related (summit cold, altitude sickness above 9,000 feet). Both are real, both are manageable with awareness. See our beaches, hiking and packing guides for specifics.
Is it expensive?
Yes, relative to most mainland US destinations — see our budget breakdown for what the real levers are. Cooking some meals, travelling in shoulder season and skipping resort fees by staying in a condo are the three changes that move the number most.
Should I tip?
Standard US tipping norms apply: 18–22% at sit-down restaurants, $1–2 per drink at bars, $2–5/night for hotel housekeeping. Food trucks and counter service: tip jars are common and appreciated but not expected at the same rate as table service.
Can I drink the ocean water? (and other beach questions)
No — ocean water is salt water. Hawaiʻi's beaches have varying swimming conditions; always read posted warning signs, never swim at a beach with a closed sign, and check the Hawaiʻi Beach Safety website for current conditions before you go.