Yes PPs are correct. Anyone is free to dine and shop at Aulani, and book the spa, but as mentioned, any amenities of the resort you wouldn't be able to use - loungers, pools, character meets, Aunty's Beach House, etc. You can use the beach and lagoon because those are public, but you wouldn't be able to use the lounge chairs or umbrellas on the beach without a resort wristband. Also, if you spend at least $50 at the store, spa, or one of the restaurants, they will validate parking for up to 2.5 hours. After that its $12 for the first hour and $5 an hour after that.