My favorite part about living in Hawaii is the view from where I live. I am tremendously blessed to have the spectacular 'perch' that I do looking over Diamondhead, Waikiki, Honolulu, and past the airport to Ko'olina.
If you are looking to see such a spectacular view of Southern Oahu, drive up Round Top Drive to Pu'u Ualaka'a State Park for sunset. You will find a large grassy area to share a picnic or lay back and watch the clouds roll by. Or you can stand up a bit higher at the lookout and identify all the places and roads you have been while in Honolulu.
If hiking is more your style, there are plenty of trails up on this scenic route as well. Or, perhaps, you will just enjoy the curly queues and hairpins of the the Tantalus-Round Top Drive loop.
No matter what you do, it is a refreshing reprieve from the busy scene in Waikiki!