They offer a standing 25% discount to locals, here is what I read about day passes.
http://dvcnews.com/forum/showthread.php?13110-Aulani-trip-report
Bill
I'll say while it;s annoying if a handful of people sneak in, I've got much bigger issues in the world to worry about and I am an Aulani owner. I didn't notice any major issues of non-wristbanded people at the pool our last visit.
However not according to his... but this is Disney what happens onsite doesn't always reflect what is said on websites.
http://resorts.disney.go.com/aulani-hawaii-resort/faq/resort-information-faq/
Q: Can I purchase a day pass for Aulani?
A:
Sorry, Aulani does not offer a day pass. Most amenities—including the pools, beach equipment and activities—are exclusive to overnight Guests staying at Aulani.
Day Guests are welcome to enjoy the dining, shopping and spa experiences offered at Aulani.
Parking Validation for Day Guests
The following parking fees apply for day Guests visiting Aulani:
Valet parking for day Guests is $35 per day
Self-parking for day Guests is $10 per hour—or a maximum of $35 per day
Enjoy complimentary self-parking or valet parking at Aulani for up to 4 hours when you spend $35 or more at the following venues:
‘AMA‘AMA – Contemporary Island Cooking
Makahiki – The Bounty of the Islands
The ‘Ōlelo Room, valid for purchases made between 5:00 p.m. and 11:00 p.m.
Off the Hook, valid for purchases made between 5:00 p.m. and 9:00 p.m.
Laniwai – A Disney Spa (validation available with the purchase of treatments only—does not include spa merchandise)
To have your parking validated, please bring your parking ticket and purchase receipt to ‘AMA‘AMA, Makahiki or Laniwai – A Disney Spa.
Note: Parking validation is not available with merchandise purchases or at other Aulani dining venues.