I've been to the Big Island and Maui. Maui was great while the Big Island sucked. Being a geologist I was stoked for the Big Island but I felt let down. Maui on the other hand had a ton of stuff to do. Stay on the dry side but definitely do the drive to Hana one day. As well go up to the top of Haleakala and drop into the crater to hike around (we did a 23km loop that took the better part of the day).
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