There are easy hikes on Oahu with great views like Diamondhead, Makapuu Lighthouse, and the Aiea loop trail.
Some eats you might want to try Lucky Belly, HASR Bistro, The Pig and The Lady, Sidestreet Inn, Alley Restaurant, Forty-niners, Boots & Kimo, Cinnamons, Rainbows, Dean's Drive Inn...