My understanding is that only Aulani guest are allowed to use the pools, but anyone can walk on the grounds.
Originally Posted by mrclempo
Here's how a KHON-2 news story (Disney’s Aulani resort opens to packed house) quoted a Disney spokesperson:
Although the beach and pool areas at the resort as well as restaurant and lounges are open to the general public, there are some restrictions.
“For our hotel guests we do wrist band them so they can use the water slides and the pools and they have exclusive use of those,” said [Disney publicist John] McClintock. “We do invite everyone to come and enjoy what’s available.”