A trip to the Pali Lookout with not disappoint you! Follow Pali Highway and look for the Pali Lookout signs. This is the windiest place on the island, so be careful. The view is fantastic, you can see all of Kaneohe and Kailua from this lookout point. There is a path to hike down also, though it is "improved" walkway :)
A good hike with a spectacular view of the ocean. See plants and animals native to the islands. I would recommend a trip out that way. Take H2 north and follow signs for Mokuleia, road dead ends in Kaena Point preserve. Walk to lookout.
Nu'uanu Pali Lookout give you a great view of
windward Oahu with the surrounding mountains looking toward the ocean.