Waikele Premium Outlets is recommended. About an hour on the shuttle bus which you need to pre-book. The hotel should be able to tell you where to organise your tickets in advance. Get them ahead of the day you want to go.
Waikele Premium Outlets ~ A popular destination for shoppers seeking discounted designer goods, the Waikele Outlets are open daily (Sundays It's about a 45 minute drive from Waikiki, and shuttle transportation is available.