I called to make our reservation paying cash. I am glad I called because the super helpful CM (thank you Michael!) told me that if I made a room only reservation, I would need to put a deposit down of one nights fee for the room. We were renting a 2 room villa, so it was around $1,000. He said if we booked a package, we would only have to put a deposit of $200ish (cannot remember the exact amount) down. I thought a package would need to include an excursion, which we did not want, but Michael explained that a rental car, or a shuttle from the airport would qualify as a package. We were planning on booking a shuttle to and from the airport anyway, so we booked the package. It was great. One thing to note, with a package you have to pay in full a month prior to your arrival. With a room only, you can pay the remaining balance on arrival. We just made payments anytime we had extra money. Hope that helps!
We also only rented a car for one day, to go to Pearl Harbor. I made the reservation in advance for the Alamo inside Aulani. We did not want to pay the $37 a night parking fee!