Hi Kevin! You can absolutely mail a box to the Walt Disney World Resort you will be visiting ahead of your arrival date. Simply address your package to
Disney's Grand Floridian Resort & Spa, butmake it to your attention, including your reservation number andarrival date. When your box arrives the staff will know it's for a guest and they can referenceyour reservation number and arrival date and store it until yourarrival.
Using a handy sharpie marker, the front of your box should look like this:
Disney's Grand Floridian Resort & Spa
Attention: Your Name Here
4401 Floridian Way
Lake Buena Vista, Florida
32830-8451
Reservation # xxxx
Date of Arrival 2/xx/2014
You can also call the resort at 407-824-3000 to let them know you will be sending a package so they can be on the look out.
I hope your upcoming vacation is magical and memorable.
~Juliette