All posts great but a lot of the suggestions are for Waikiki and they are way out past Ewa at the new Disney resort so a trek into Waikiki will be a traffic fight.
A hint for driving into Waikiki is to parking is between 5 and 8 dollars an hour unless you find a cheap spot or one that has validation, also a lot of places do not take credit cards or are a little risky to use a credit card in so carry cash. One suggestion is a propark garage that is adjacent to Ross 333 Seaside Avenue, Honolulu, HI then buy something cheap at Ross and they will validate your parking for an hour or so. Also you can get three hours of free parking between the hours of 10am and 3pm at the Waikiki Beach Embassy Suites port cochere. You will need to provide a same-day receipt from any Waikiki-Beachwalk restaurant or shop.
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My opinion is worth what it costs that and $3.75 will get you a cup of coffee 
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