Before you leave go to a good bookstore and purchase these "blue" books:
1. The Ultimate Kauai Guidebook
2. Maui Revealed: The Ultimate Guidebook
3. Hawaii The Big Island Revealed:The Ultimate Guidebook
If you cannot find the books then go to this website: www.wizardpub.com
Rent a car with another couple or do your own thing..it's cheaper and lots more fun than being with a group.