As of Feb. 23, 2015, Islander on the Beach onsite laundry room was closed to owners and guests that do not stay through the complex. There is a 24-hour laundry facility up the road north in town, Kapa'a Laundromat and other local options as you can read about below.
DO-IT-YOURSELF LAUNDROMAT OPTIONS AVAILABLE:
LAUNDROMAT EXPRESS (7AM - 9PM):
Great spot. Newer, clean. Nice, larger machines. It is located down the road a mile or so north in the Royal Coconut Plaza tucked in behind the restaurant.
BASUEL'S LANDROMAT (RECENT GUEST COMMENT THAT USED THEIR MACHINES):
Used the Basuel Laundromat. Very close, newer machines. Didn't have any hassle. Would recommend because of it's location.
Basuel's can be found at http://www.yelp.com/biz/basuels-laundromat-kapaa.
KAPA'A LAUNDROMAT IN KAPA'A (OPEN 24 HOURS)
no website, but is in the ACE parking lot a mile or so up on the left hand side when you get into Kapa'a proper.