Nicole, add the third adult on now.
Your file will be updated and it will take less time when you check in then.
yes, it is an additional $25 per night for the 3rd adult.
They might or might not ask for the additional money at this point since you already have the ressie.
You pay the hotel bill when you check out of the hotel.
Normally, you only pay a one night's deposit when you make a ressie.
Rest of the amount owed for the room and any other charges, would be on the check out bill.
I'm sure they will just add the additional $25 of the first night onto that final bill.
You can have charging privileges put on your hotel room for park shopping, dining, etc.
anything you buy in the park, you can have it sent to the front store to be held for you until you leave the park, or you can have it delivered to your hotel room. no charge for that with hotel guests.
When I shop in the park stores, I always tell the TM to wrap my items for storing them in my luggage. They do a great job and nothing has even been broken when I travel back home.
I love that my purchases can be delivered back to my hotel room