Hawaii travel guide

Hawaii is a US state made up of volcanic islands in the middle of the Pacific, with beaches, active volcanoes, rainforest valleys and a living Native Hawaiian culture. Each main island has its own character, from busy Oʻahu to the lava fields of the Island of Hawaiʻi, and it suits beach holidays, road trips, hiking and surfing alike.

Updated 17 October 2026 · 5 min · By Roamsim

Highlights

Waikīkī and Diamond Head

Honolulu's famous beach district on Oʻahu, with gentle surf for learning, and the volcanic crater of Diamond Head behind it. The short, steep trail to the crater rim gives views over the city; check whether advance reservations are needed.

Pearl Harbor

The Pearl Harbor National Memorial tells the story of the attack of 7 December 1941, which brought the United States into the Second World War. The USS Arizona Memorial sits above the sunken battleship.

Hawaiʻi Volcanoes National Park

On the Island of Hawaiʻi (the Big Island), the park includes Kīlauea, one of the world's most active volcanoes, with crater-rim trails, lava tubes and steaming vents. Eruptive activity varies, so check the park's current conditions.

Haleakalā

A dormant volcano on Maui whose summit rises above 3,000 metres. Watching sunrise above the clouds is a classic experience, but it is cold at the top and sunrise access may require a reservation.

The Road to Hāna

A winding coastal drive on east Maui with hundreds of bends, one-lane bridges, waterfalls, black-sand beaches and rainforest. Allow a full day, drive slowly and respect private property and residents.

Kauaʻi's Nā Pali Coast and Waimea Canyon

Kauaʻi, the 'Garden Isle', has sheer green cliffs along the Nā Pali Coast, best seen by boat, helicopter or on the Kalalau Trail, and Waimea Canyon, a deep red-walled gorge with viewpoints along the road.

Oʻahu's North Shore

In winter, huge waves at Waimea Bay, Sunset Beach and the Banzai Pipeline draw surfers from around the world. In summer the water is often calm enough for swimming and snorkelling.

Mauna Kea stargazing

The summit area of Mauna Kea on the Island of Hawaiʻi hosts major observatories. Its visitor information station area at mid-altitude is a popular place to stargaze; the summit is sacred in Native Hawaiian tradition.

Interesting facts about Hawaii

  • Hawaii is the only US state made up entirely of islands, and it became the 50th state in 1959.
  • Measured from its base on the ocean floor, Mauna Kea is taller than Mount Everest.
  • The Hawaiian alphabet has just thirteen letters: five vowels, seven consonants and the ʻokina, a glottal stop.
  • ʻIolani Palace in Honolulu was the residence of Hawaii's last monarchs and is often described as the only royal palace in the United States.
  • Hawaii does not observe daylight saving time, so its time difference with the US mainland changes during the year.

Best time to visit

Hawaii is warm all year. The drier summer months, roughly April to October, have calmer seas on north-facing coasts and more sunshine, while winter, from about November to March, brings more rain and big surf on north shores. Humpback whales are seen from roughly December to April. April to May and September to October are often the best balance of weather, crowds and prices. Windward (north-east) coasts are wetter than leeward ones on every island.

Practical information

CapitalHonolulu
CurrencyUS dollar (USD)
LanguagesEnglish, Hawaiian
PlugsType A, B
Voltage120 V, 60 Hz
Emergency911
DrivingOn the right
TippingUS customs apply: around 15 to 20 percent in restaurants, plus tips for tour guides, drivers, valets and housekeeping.

Getting around

A hire car is the easiest way to explore every island except central Honolulu, where traffic and parking are difficult. Oʻahu has an extensive public bus network, and Honolulu's rail line is gradually opening. Ride-hailing is available on the main islands, mainly around towns and resorts. Inter-island travel is by plane; there is no regular inter-island ferry for visitors between most islands. Distances look short on the map, but roads on Maui and the Big Island can be slow, so allow time.

Staying connected in Hawaii

Coverage is good in Honolulu, the main towns and resort areas, with 5G in the cities. Signal is patchy or absent along parts of the Road to Hāna, on the Nā Pali Coast, in Waimea Canyon, at Haleakalā summit and across remote parts of the Island of Hawaiʻi, including some areas of the national park. Wi-Fi is common in hotels and cafés. Download offline maps and audio tours before driving. Install an eSIM before you fly and switch it on when you land.

See Hawaii eSIM plans · How to install an eSIM

Useful apps for Hawaii

  • Google Maps: Driving and finding beaches and trailheads; download offline maps for areas with no signal.
  • Shaka Guide: GPS-triggered audio driving tours, including the Road to Hāna and Big Island routes, that work offline once downloaded.
  • Recreation.gov: Booking reservations for some national park activities, such as Haleakalā sunrise where required.
  • DaBus2: Real-time arrivals and routes for Oʻahu's TheBus network.

Common questions

Which Hawaiian island should I visit first?

Oʻahu has Honolulu, Waikīkī and Pearl Harbor and suits a first visit. Maui is popular for beaches and Haleakalā, Kauaʻi for scenery and hiking, and the Island of Hawaiʻi for volcanoes and variety. Many visitors combine two islands.

Can I use my phone and mobile data in Hawaii?

Yes. Coverage is good in towns and resorts, but drops out on remote roads, trails and mountain summits. Visitors from outside the US can use a travel eSIM for local data without changing their physical SIM.

Do I need reservations for popular sights?

Several popular sites have introduced reservation systems or entry limits, which can change. Check official websites for places such as Diamond Head, Hanauma Bay and Haleakalā before you go.

How can I visit respectfully?

Learn a little about Native Hawaiian culture, respect closures of sacred sites, keep off private land, do not touch turtles or monk seals, use reef-safe sunscreen and be considerate in communities that are still recovering, such as Lahaina on Maui.

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