My SO and I are going to Hawaii in 3 weeks, going to the Big Island and Oahu. It is a 10 day trip but really 8 days if you exclude travel days.
We used airline, hotel, and credit points to purchase the tickets and a hotel room on each each island. After all totaled we are paying about $300 in fees and a night in a hotel that points do not cover. We are renting a car on each island but with coupons the cars will be less than $170/week. The hotels include breakfast.
On the advice of my friends who live in Hawaii, I am budgeting $125/day for food, excursions, souvenirs, but do not plan to hit this limit. We are big outdoor people so we are planning to go hiking and walking quite a bit which are free. Some things like museums and shows require a fee but these are covered with the daily budget.
If you have any airline or credit card points to redeem this would be the best way to go. Try to book early. Don't limit yourself to only one airline. If you can get a cheap ticket on American from Alabama to LAX and then a cheap ticket from LAX to Hawaii on United, don't be afraid to purchase 2 tickets, just give yourself enough time.
Also MMM just posted an article about how to cash in on new credit card points and offers. If you play the game right (and are disciplined) you could easily accrue enough points with regular spending for a rewards ticket.