Here’s a cool new site that helps people find peer to peer car rentals in their area: Relay Rides.
Plunk in your zip code and you’ll see all the renters in your area. As of just now, there’s one 2000 Ford Mustang for rent on the entire island of Maui. Not a great selection. But, perhaps more Maui-ans will list their cars. In the meantime, there are plenty on Oahu.
If you’re looking for a local car to rent by the hour or by the day, this is an interesting way to go. Here’s Walt’s Ford Mustang: