I booked a package with Disney that includes multiday MYW tickets but I will be there several days before my check in date, staying offsite. Is there anyway I can use those tickets before I arrive at the Disney resort?
Yes there is. In the past, package tickets were tied solely to your check in date and could only be encoded onto your resort ID. Not so now. Your MYW tickets can be obtained up to 5 days prior to your check in date at Guest Relations or up to 3 days prior at your resort's Lobby Concierge. You must have continuing reservations (example: a seven day trip with a three day reservation not on the package followed immediately by a four day reservation on the package AT THE SAME RESORT ONLY) to do this. You will only be able to receive paper tickets when doing this and they cannot be transferred to your resort ID at any time.
But a word of warning on this: the procedure to do this is not widely known by all CMs and does entail a little extra effort on their part. It's very time consuming and complicated to do. Don't be surprised if you are told no. Ask the CM to check with their supervisor if they say they cannot do it. Currently, this is a case of some CMs can and will do it while others can't/won't.