Honolulu is the capital city of Hawaii State situated on the Southeast Coast of Oahu Island. The city has the finest beaches in the state. They are best for watching blazing sunsets and for surfing. The blue-green coloration of waters of narrow beaches in the city is very attractive. The Diamond Head Beach Park is one of the finest beach in Honolulu. It has almost 2 acres of sea cliffs. The narrow beach in the park is best for surfing. The park is situated in the foothills of an extinct volcanic crater known as Diamond Head. Best Beaches In Honolulu Diamond Head Beach Park. Waikiki Beach. Kahala Beach.