I sent a package to myself in January with some food (pop, bottled water, crackers, some candy) and other items in it (toilet paper, nalgiene bottle, kleenex, etc). It worked great for me becuase I did not rent a car or hire a towncar...I took Mears. I would reccomend using UPS. I did UPS ground and it was $14.99 to send the package (it was 16lbs). I sent my package on Jan 13th and it was estimated to get to my resort on the 19th (my arrival date) it was not there when I arrived (I got there around 12:45pmish), but that night when I got back from the parks I had a message from the front desk and they brought the package to my room. Check out the UPS website to figure out how many days in advance to send your package. If you have any other questions I would be happy to answer them.
Here is the info I put on my package:
Guest Name
Resort Address
Hold for arrival on _________
Reservation number