My personal favorite day on Maui is the day we drive the Road to Hana. The windy road full of hairpin turns is so stunningly beautiful I am in a constant state of awe. We haven't ever driven the full drive, instead preferring to take our time, stop every few miles, swim, jump off waterfalls and explore.
Molokini was incredible, the water clearer than I've ever seen it and absolutely teaming with fish.
Watching the crabs and the sunset on the last night before we headed home.