Just some ideas, last year when I was in Hawaii I paid the following:
$8 for a hamburger, no fries
$6 for a 16oz cup of coffee
$3.32 for a gallon of gas
$4 for an ice cream cone, 2 scoops

80% of Hawaii’s food products are imported so you will pay a little more for food, but like the first poster said, it is not too far from NYC prices or LA prices, think along the lines of airport pricing, a little more because there is demand and no alternative.

As for just using cash for tips, cabs, breakfast and lunch you should be okay with $1k.

Probably 1k if you are planning to buy souvenirs or food. Don’t bring too much because when traveling to Mexico things like that can easily be stolen.

$1000 should be enough i would think as long as u take your cards just in case

How expensive Hawaii is depends on where you’re from. I’m from NY and my husband and I didn’t find Hawaii that much more expensive and was quite comparable to NY prices. $1,000 should do if you plan on charging most meals and entertainment and souvenirs. If you do a little bit of pre-planning you can find great cheap places to eat to minimize spending–eat like the locals and you’ll find the best meals at the best prices.

Have fun!