Oahu is 44 miles (70 km) long and 30 miles (48 km) wide, and has 227 miles (363 km) of shoreline. Population: 953,207, according to the 2010 census. Partly due to this fact, Oahu is nicknamed The Gathering Place.
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Urban Honolulu is very much a walkable city. It's a little over six miles from the iconic Diamond Head State Monument to the heart of Downtown, a flat south-to-north stretch with several straight-line routes along Ala Moana Boulevard, King Street, and Beretania Street.
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?
In fact, Oahu is the best Hawaiian island to be without a car. While other islands, like Kauai, would be almost impossible to navigate without a car, Oahu is well connected by public transportation and ride share. Plus, most of Honolulu's main sites are close together.
If you're wondering whether 7 days is too long to stay in Oahu, I can say from first hand experience that it's not- in my opinion, it's actually the perfect amount of time to see some of the best highlights the island has to offer.
Oahu is the site of Pearl Harbor (where Japanese forces staged their first attack against the United States in World War II), Waikiki (with its world-famous beaches), and the North Shore (known for surfing).
If you're short on time, here's a quick answer to your question: Oahu is the most populated Hawaiian island because it has the largest city, the state capital, a strong tourism industry, diverse job opportunities, and a central location in the island chain that makes it accessible.
You should plan to spend around $333 per day on your vacation in Oahu, which is the average daily price based on the expenses of other visitors. Past travelers have spent, on average, $52 on meals for one day and $21 on local transportation.
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.
While O?ahu is easily the busiest Hawaiian island, it's also the most diverse and active thanks to its lively event calendar and evolving metropolitan influence. The surf scene is notorious on the North Shore of O?ahu, and both the windward and leeward coasts are home to some of Hawai?i's best beaches.