We're going to WDW 9/1-9/6 and are thinking of shipping somethings down so they're at our resort (ASMovies) ahead of time. It will be me, DH, DD (2.5), and DS (4 months), and I'd like to send down the extra diapers, wipes, and toiletries (especially since the new TSA rules were implemented).
How far in advance should we send it (we live in central PA), and what service seems the best (UPS, FedEX, USPS)? Do we just label the outside of the box w/our resort name & address, and our names? Any other info?
How far in advance should we send it (we live in central PA), and what service seems the best (UPS, FedEX, USPS)? Do we just label the outside of the box w/our resort name & address, and our names? Any other info?

I just use the post office. Put your name, resort reservation# and dates of stay on it in big letters. I also sent it with a signed confirmation so I knew that they received it.