I did a doors off helicopter ride in Maui. It was incredible. I know they do it Kauai too, and i'll be there next summer. Anyone know who does it there?
I also have done Maui's Molokai, West Maui Mountain tour before. That was aweinspiring due to the seacliffs and the waterfalls. I did it through www.maui-vacation.net
and got a good price. I was going to do the Big Island Lava/volcano tour this last time I was in Hawaii, but the lava had stopped flowing. I think it's back though.