Ship it to GUEST [name], c/o [the resort name, with street address].
You will also want to write on the box (where it can be easily seen) ATTN Bell Services, hold for arrival [date], and include your reservation number. That way it will definitely be held at Bell Services for you, and a note will be placed in your reservation record that it has arrived, so they will see it when you check in.
For best results send it via UPS or Fedex, because they deliver directly to the resorts. The USPS mail goes to a central processing center first, which will delay it getting to the resort. I would time it to arrive a day or two before you, but not longer than that. (Not fair to ask them to hold it for a long period of time, IMO.)