Waikiki has some beautiful parks with feature fountains, sports facilities and palms to shade beneath on a hot day.

Amongst the most popular are Ala Moana Beach Park, Kapiolani Park, with its amazing views of Diamond Head and the Koolau Mountains, and Diamond Head Beach Park, along the coast at Diamond Head itself.

To discover more about diamond Head take the link from the main Waikiki page. 
 
Waikiki
Parks
Kapiolani Park has views of Diamond Head and the Koolau Mountains(below).