Some people get by quite cheaply while others rack up huge balances on their credit cards. Airfare to Hawaii is usually one of the heftier parts of the budget. Fares vary greatly, particularly from the US mainland. Traveler's checks are best carried in US dollars, but other major currencies can be exchanged at larger banks and the international airport.
ATMs are widespread.
We encourage you to verify any critical information with the relevant authorities before you travel. This includes information on visa requirements, health and safety, customs, and transportation.