Recent Hawaii visitors from the US have reported spending less than similar tourists spent per day last year. This probably reflects more frugal habits on the part of tourists, but some prices are coming down. Per person per day, they report spending between $30 and $40 on food, about $15 or $20 on entertainment, $15 on transportation (which could include two or three people sharing an economy rental car, waiving insurance--though interisland fares can take you well above average), and about $15 or $20 a day on shopping.
you don t need any money. you can sleep on the beach or the streets for free. there are plenty of food in the garbage cans, especially the garbage bins outside restaurants and fast food placed. you can hitch hike to anywhere you want to go for free. Enjoy and have fun in paradise , you don t need money, it s free for you to enjoy!
Can t really answer that cause I don t know if you plan to shop, take excursions or just wander around. Food is about triple what it is in the states. Best to seek out the markets they set up once a week rather then shopping in tourist stores. Walk as much as possible because taxis are spendy.