Oahu is jam packed with beautiful scenery and unique places. Moanalua Valley is both. Steeped in history and scenic beauty, a drive through here is unforgettable. When you pop out the tunnel on the windward side, you can see from Kualoa to Olomana.
You can add a scenic drive through the H3 to any route like a half day Pearl Harbor and South Shore combo tour. This is one of the best rainy day activities because you can see dozens of waterfalls from the road. You will recognize this view from several television shows and movies.