The immense bamboo forests on Maui are an underrated attraction in my opinion. The sound of the bamboo clacking together in the cool and fragrant rainforest breeze is something I'll never forget.
Haleakala sunrises are hit or miss. If it's a hit, it's a really big deal. If it's a miss...well...you regret getting up that early to go freeze.
The bamboo forests feel like they go on forever (and that's not a bad thing). Taken somewhere along the Road to Hana.