You want to be careful about exposing your machine to too much humidity, and usually, electrical outlets in your cabin are few and located in out-of-the-way places. That said, if i had a balcony suite, sitting out there stitching on sea days sounds heavenly! Handwork might be a more practical option.....have fun! If you are going to Maui, I hope you are renting a car and driving the Road to Hana!