Waimea Bay is the archetypal North Shore big-wave spot: a wide, crescent-shaped bay that focuses large winter swells into enormous breaking waves. In summer, the same bay is completely calm — one of the best swimming spots on Oahu, with crystal-clear water, a sand bottom, and a small rock outcropping in the shallows that serves as a jumping platform. The transformation between winter (terrifying) and summer (idyllic) is one of the North Shore's most striking characteristics.
The bay is surrounded by Waimea Valley, now managed as a nature and cultural park. The road behind the beach leads up the valley to a waterfall with a swimming hole, through gardens of native Hawaiian plants, and past archaeological sites including a heiau (traditional temple). The valley was the site of one of the largest traditional Hawaiian communities on Oahu before European contact. Combining the beach with a valley walk makes for a full day.