Hi there, Joyce!
It's so exciting to be planning a trip to paradise.
Aulani, a Disney Resort and Spa, has some of the most stunning views anywhere, and the resort itself is absolutely gorgeous. It sounds like the perfect vacation destination to me.
Although Aulani does not give you lanyards when you check into the resort, you may be able to find them available for purchase at the resort.
Kalepa's Store is located near the lobby on the 'Ewa Tower side of the resort, and it's a great place to find things like this. They'll have all sorts of souvenirs and sundries, and they have had lanyards available for sale there. While I can't guarantee they will have them when you travel, they do have them available as recently as today.
If you're looking for something specific, check out the selection available through the
Shop Disney Parks. A recent search turns up an adorable Stitch one, in addition to many other options. If you have a lanyard of your own, the room keys can be hold punched to fit on just about any lanyard.
Have an absolutely magical time during your vacation! Mahalo for your question.
Anna