We are arriving on 8/23 and staying at Coronado Springs. We will be staying for 6 days. The free dining plan starts on 8/25 so I had to book twice. Hotel only for 8/23 and 8/24 and then the hotel with dining package and tickets from 8/25-8/28. This was the free dining plan promotion.We originally planned on only going to 3 parks and one day go to Universal. We now are changing our plans and want to stay the whole time at Disney. My question is, can I just add one park day only on a previously booked dining plan? I would like to add another park day for 8/24 only without adding the dining plan for that day.( This day is not included in the free dining plan option. Free dining plan starts on 8/25). And if I can, how much would it be? Thanks!