We went out for a short hike on the West Side to the "Pink Pillbox" aka Pu'u O Hulu. It is a short but very scenic hike, which takes you to 4 different pillboxes and you have beautiful views to Waianae Valley, Mt Ka'ala and are and of course the blues ocean.
It is a good place for whale sighting too.
Actually there are two bigger hills and this one called Puu O Hulu Kai and the other Puu O Hulu Uka.