Itinerary for 3 day trip to Oahu

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Here's an ideal itinerary for 3 days in Oahu:

Start your day with a visit to the iconic Diamond Head State Monument. This hike is a must-do for any first-time visitor to Oahu. The trail is about 1.6 miles round trip and takes about 1-2 hours to complete. The views from the top are breathtaking!
After your hike, head to the nearby KCC Farmers Market for some delicious local food and fresh produce. This market is open on Saturdays from 7:30am-11am.
Spend the afternoon exploring the historic town of Honolulu. Visit the Iolani Palace, the only royal palace in the United States, and the nearby King Kamehameha Statue. Take a stroll through the beautiful grounds of the Hawaii State Capitol and the Washington Place, the official residence of the Governor of Hawaii.

Start your day with a visit to the Pearl Harbor National Memorial. This historic site is home to the USS Arizona Memorial, the Battleship Missouri Memorial, and the Pacific Aviation Museum. Be sure to arrive early to secure your tickets for the USS Arizona Memorial, as they tend to sell out quickly.
After your visit to Pearl Harbor, head to the nearby Aloha Stadium Swap Meet for some souvenir shopping. This market is open on Wednesdays, Saturdays, and Sundays from 8am-3pm.
Spend the evening at the Polynesian Cultural Center, where you can experience the cultures of Hawaii, Samoa, Fiji, Tahiti, Tonga, and Aotearoa (New Zealand). Enjoy a traditional luau dinner and a spectacular evening show.

Start your day with a visit to the North Shore of Oahu. This area is known for its beautiful beaches and world-famous surf spots. Stop at the Dole Plantation for some delicious pineapple treats and a ride on the Pineapple Express train.
Spend the afternoon at the beach. Some of the best beaches on the North Shore include Waimea Bay, Sunset Beach, and Ehukai Beach (home of the Banzai Pipeline).
End your day with a sunset dinner cruise. There are several companies that offer dinner cruises departing from Waikiki Beach. Enjoy a delicious meal and stunning views of the sunset over the Pacific Ocean.

I hope this itinerary helps you plan your trip to Oahu! Let me know if you have any questions or need any further assistance.