Mānoa & Tantalus
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.
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Honolulu's shore is often sunny while Mānoa Valley and the Tantalus ridge, a few miles inland and higher up, catch passing trade-wind showers on many days of the year. Expect warm, humid air, brief rain that comes and goes, wet trails even on clear days, and cooler, breezier conditions at the lookout. The National Weather Service treats May to September as Hawaiʻi's dry season and October to April as the wet season, when longer rains and flash floods are more likely. 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.
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.