Pearl Harbor & the West Side
A full Oʻahu day from Waikīkī: an early boat program to the USS Arizona Memorial, an optional tour of the Battleship Missouri on Ford Island, then west along the dry Waiʻanae coast to the calm Ko Olina lagoons, the big-wave beach at Mākaha and the end of the road at Keawaʻula Bay for the late light.
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The Waiʻanae coast is the sunny, dry side of Oʻahu: most days are warm and bright from morning to sunset, with trade winds that cool the air but hide how strong the sun is. Pearl Harbor is warm and humid by midday. Showers are brief and more common in winter, and storms can close parks for days. Summer usually brings the calmest water on this coast; from about November to March, north and west swells can bring dangerous surf to Mākaha and Keawaʻula. These are seasonal expectations, not a forecast for your travel date; check the NWS forecast.
Admission and parking are separate. Check current conditions before departure.
A full day up Kamehameha Highway from Waikīkī: the old surf town of Haleʻiwa, honu resting on the sand at Laniākea, Waimea Bay, the paved garden walk to Waimea Falls, the Pūpūkea tide pools, the Banzai Pipeline at ʻEhukai and a shrimp plate in Kahuku before the windward drive home.
A day over the Koʻolau mountains from Waikīkī: the windy cliff-top view at the Nuʻuanu Pali Lookout, a morning on Kailua Beach, the Byodo-In Temple in its green valley, then up the windward coast past Mokoliʻi to Kahana Bay and the sea arch off Lāʻie Point.
A full day out of Waikīkī along Oʻahu's southeast shore: the early climb up Lēʻahi (Diamond Head), a morning snorkel at Hanauma Bay, the Hālona Blowhole and Sandy Beach from the safe side of the railing, and a late-afternoon walk up the paved Makapuʻu Point Lighthouse Trail before the view over Mānana island at Makapuʻu Lookout.
Honolulu's green back country in one day from Waikīkī: an early walk to Mānoa Falls, the University of Hawaiʻi's Lyon Arboretum, lunch in Mānoa, Queen Emma's summer palace in Nuʻuanu, then the historic Tantalus–Round Top Drive to sunset over the city at Puʻu ʻUalakaʻa.