You can get great discounts by using Hawaii Entertainment Book, that is full of coupons for Hawaii activities, restaurants and shows. Currently you can get 35% OFF all 2012 Entertainment Books with ONLY $1 shipping! Another way is to use the coupons from other websites that are offering the coupons and offers from their partners.
Here are some useful coupons that are offered by discounthawaiicarrental.com
20% off 5 hours Morning Molokini and Turtle Town Snorkeling Adventure with Lani Kai Friendly Charters
Enjoy your coupons and plan better for your affordable Hawaii vacations!