From an email from Avis:
Avis Hawaii Day
AWD Number: A158500
The savings of up to 35% applies to Avis leisure rates and is applicable only to the time and mileage charges of the rental. Offer does not apply to car group X. Taxes, concession recovery fees, vehicle license recovery fee and customer facility charges may apply and are extra. Optional products such as LDW ($29.99/day or less) and refueling are extra. Please mention AWD A158500 to take advantage of this offer. Offer is available for U.S. and Canadian residents only for rentals at participating locations in Hawaii only. Offer may not be used in conjunction with any other AWD number, promotion or offer. Discount valid on rentals checked out no later than 06/15/15. Offer is subject to vehicle availability at the time of rental and may not be available on some rates at some times, including some online rates at Avis.com. Car rental return restrictions may apply. Offer subject to change without notice. Holiday and other blackout periods may apply. Renter must meet Avis age, driver and credit requirements. Minimum age may vary by location. An additional daily surcharge may apply for renters under 25 years old. Rental must begin by 6/15/15.

{Note: given the no-stacking limitation, this may not be worthwhile if you have an AWD that gets you a discount of 15-20% off standard weekly rate.}