Hi Heather,
You can absolutely send a package ahead of time to your Walt Disney World Resort. In some cases, it might be cheaper to send items ahead than pay for the airline's luggage fee.
You will need to address your label the following way:
Guest name (listed on reservation)
c/o Name of the hotel
Hold for guest until arrival on 00/00/0000
Reservation #00000000000
Hotel street address
Lake Buena Vista, FL 32830
The address for the Wilderness Lodge is 901 Timberland Drive, Lake Buena Vista, FL 32830, USA.
They will hold the package for you and you can ask for it upon check in.
Have a magical vacation!
Beth