At least five days on Oahu is best if you want to spend some days at the beach, hike and explore different coasts of the island. With 7 days on Oahu, you can really slow down and explore a variety of activities around the island. Visiting Maui, too?
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Four or five days in Oahu is even better if you want to hike, visit some cultural sights, go kayaking, or just slow down a bit. With seven days in Oahu, you should have enough time to discover your own favorite beach and get a little sampling of everything, from museums and historic sites to gardens and waterfalls.
A 3-day itinerary for Oahu is the minimum time I would recommend unless you are just transiting through here on your way to another island. You could just as easily fill a whole week on Oahu if you're interested in doing more hikes, beach days or spending extended time at cultural sites and museums.
If you wish to discover the island as a whole, we recommend that you stay at least 5 days so that you have time to enjoy its various attractions and go on a few hikes. If you prefer to make only a quick stop to get an idea of life in Honolulu and do only the essentials, 3 days may be enough.
If you're only hanging out in or close to Honolulu or staying at your resort the entire time, you can get by just fine without a rental car, given the island's solid public transit options and availability of rideshare drivers, taxis, and guided tours.
Many visitors enjoy taking bus tours to conveniently explore the Islands. For most islands you can also get around by shuttle, taxi, ride-sharing app such as Uber or Lyft, or public transportation.
A 4 day Oahu itinerary is perfect for your first visit if you are also Hawaiian island hopping to Maui or Kauai. If you have enough time, 5 days on Oahu or even on a week on Oahu will give you more time to slow down for hiking or relaxing at the beach.
A 4 day Maui itinerary will give you enough time to snorkel at the Molokini Crater or beach hop around the south and west coasts. If you can spend 5 days in Maui or more, you can add extra excursions like a day trip to Lanai or spend time relaxing on the beach.
But, there are important differences between Maui and Oahu vacations. If you're looking for a typical Hawaiian tourist vacation, Oahu offers Waikiki Beach, historical memorials and modern culture. Meanwhile, travelers should head to Maui to enjoy outdoorsy adventures, from snorkeling to hiking volcanic peaks.
It's always advisable to bring money in a variety of forms on a vacation: a mix of cash, credit cards, and traveler's checks. You should also exchange enough petty cash to cover airport incidentals, tipping, and transportation to your hotel before you leave home, or withdraw money upon arrival at an airport ATM.
April thru June and mid-August thru mid-September are Hawaii's low seasons, and airfares are lower then. No matter what time of year you travel, you may be able to score better deals if you travel midweek.
But these three issues — high taxes, excessive land-use and zoning regulations, and the federal Jones Act — are some of the most important in explaining why Hawaii's cost of living is so high.