Wow, Kula is really remote. What is the job?
Generally, travel jobs have several compensation components quoted separately: hourly, per diem, housing, travel, insurance, bonus, and sometimes car rental. Occasionally, agencies will lump all tax free reimbursements together and you are responsible for paying expenses such as housing and car rental. That sounds like the case here. (No such thing as free housing, it is just another way of splitting the pot of money available from the bill rate).
To me, the question is can you at least break even with the cost of housing, food (much more than the mainland), plane fare, rental car and gas, and some fun money. If so, go for it, it sounds like a much needed complete break. Don't expect to save money.