Headed to Hawaii - Maui
Gotta agree with 340 833 dart, definitely do the Haleakala bicycle ride. And don't forget the frozen peas if you do any snorkeling or scuba, the fish will come up and eat right out of your hands.
Didn't get to do the road to Hana the only time I was on Maui - good excuse to have to go back! I loved it and would move in a heartbeat if I could make a living there.