The guards will let you through the gate on the day you are due to arrive even if you don't have access to the property you are staying in until a later time. Similarly the Welcome Center will be happy to provide you with a wristband.
Should have no problem just go to the office they will ask for your rental address and name
“Prior to actual check in” definitely something you should check with the front desk. I had no problem getting wristbands but that’s was after checking in.
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