Happy Kids Nanny Referral Service is used by many hotels on Oahu and I tried it myself (anonymously and at my own expense) during my stay at the Aulani Resort. After filling out a web form describing our needs, I was matched with a nanny who arrived with a backpack full of activities. She had been working for the agency for 2 years and had been a nanny for a family with triplets before that. I felt comfortable leaving baby Eilan with her, and she was able to take him around our resort (but not to the ocean) so that they had an enjoyable morning together. Rates are $20 per hour with additional charges for late nights or holidays.