Aloha, Johanna!
E Komo Mai (that means "welcome" in Hawaiian) to planDisney! How exciting that you have a visit to
Aulani, A Disney Resort & Spa on Oahu on the horizon. Our family visits Hawaii every year, and we have stayed at Aulani many times. There's no place I'd rather be than riding the Hawaiian roller coaster ride and lingering in the ocean blue at Aulani.
Johanna, when we last went to Aulani, I also had trouble booking the
Pearl Harbor excursion online. I would recommend calling the Holoholo Desk at (808) 674-6320 to see if they have any availability for the excursion or if there is another one they recommend. In our case, the excursion didn't match up with our plans, so I looked for an outside company, as it is hard to get tickets to Pearl Harbor directly. Most outside companies won't pick up in Ko' Olina, but they do pick up in Waikiki. You can drive your rental car or book an Uber to the meetup spot. We ultimately booked with a company called Personalized Hawaii Tours, which arranged a meetup spot closer to Ko Olina. It was a great experience, and one of my top recommendations when visiting Oahu.
I hope this helps you, Johanna. If you have any further Disney vacation planning questions, surf back here to see me, and I'll be so happy to help you. You are part of our Disney vacation planning 'ohana. 'Ohana means family, and that means nobody gets left behind.
A Hui Hou (that means "until we meet again" in Hawaiian),
Keri