They put the cake back in the box in was delivered in by the bakery. I do not think it will last very long without refrigeration, though, due to the mousse filling. Even our all-buttercream anniversary cake was sad and mushy by Day 3. However, Bell Services could keep the cake in their fridge for you and deliver it when you want it. Not super-convenient, but... Alternatively, I'd bring Tupperware and divvy the cake up into smaller boxes that will fit in the minifridge. You'd need to call the resort for a definitive answer, but 10pm seems to be the cut-off time most places. Could you have it delivered the next day?