We ordered our
Aulani vow renewal cake through our Disney's Fairy Tale Weddings planner, but you can just call the resort's Dining Department at 808-674-6330 to place your order.
Here are the standard cakes and a little bit of pricing info on custom cakes:
https://resorts.disney.go.com/aulani-hawaii-resort/rooms-offers/in-room-options/gifts-surprises/
Here's our vow renewal cake. The design was based on our wedding china pattern. YMMV, but what we got tasted like dish sponges layered with butter. It was possibly the worst-tasting cake I’ve ever had, and certainly the worst Disney cake I’ve ever had. The cake was dry, dry, DRY, with nary a hint of the coconut flavor I'd requested. The frosting was like straight unsalted butter—no sweetness, no coconuttiness, no texture. I later learned that Aulani uses Chantilly buttercream instead of the sugary traditional buttercream used out at Walt Disney World. You’re not going to believe this, but the best-tasting part was the fondant—at least it was sweet!