Originally Posted by
ILuvParis
My trick, which I have posted here before, is to reserve the size car (for me that is usually compact or intermediate, whichever is cheaper) you would otherwise get with one of the major rental car companies. A convertible may be twice the price of that car. So, what you want to do is PRICELINE a convertible, bidding up to amount you reserved your other car for. If you get the convertible (and you probably will), great. If not, you still have the other car at a reasonable price. The only flaw I have discovered with this system is that you will more often than not, end up with an Alamo car (not my favorite company on Kauai), but hey, it's a convertible!
There is NOTHING like a convertible on Kauai! You won't regret it!

I just had a thought about this method...
I use my Diner's Club card only for car rentals because of the primary car insurance. I know that the entire rental must be paid for with the card for the insurance to be in effect.
Does a priceline rental count? I'm assuming they are paid and not the car rental company.