Your best bet, go to sources that require a Realtor to post the ad (http://hicentral.com/properties-for-rent.html) or go to the local paper here which costs $$$ to advertise in, which usually stops scammers from advertising in.
Do you know anyone here that can help you out? If not, the below advice is best:
Use a property management company
Do not send money until you verify who the legal owner is.
Get a hotel for a week.
You'll be competing with many visitors from the northern parts of the world, so I would try to go before Thanksgiving.
Here's a good article on how to bid on Priceline. I have gotten $250+ rooms for $99 buy using this technique. http://www.my-photo-blog.com/how-to-bid-on-hotels-with-priceline
(RA) MBA, e-PRO, REALTORÂ®
East Oahu Realty
I agree with all the other answers listed. Deal with a professional Realtor or Hawaii licensed agent; they are all required to post their name, Company and phone number with all properties they advertise.
Most scams start on Craigslist and unfortunately legitimate rental sites, such as Trulia, sometimes pick up those ads as well.
Don't rent anything without seeing it in person and meeting with the agent or owner in person. I have personal experience with legitimate listings being scammed and have met prospective tenants who sent $$ to someone they had not met for a property they had not seen.
Be safe, not sorry. In all real estate transactions (especially rentals) BUYER BEWARE!