Hello, Jamie and welcome to planDisney!
Jamie, as we are all getting used to making reservations with the
Disney Park Pass system to gain entry to the parks, I'm glad you dropped by with such an important question. Currently there is not an option within the system to switch your Disney Park Pass reservation. So, if you see an opening available, you will need to first cancel the other park reservation and then book one for
Disney's Hollywood Studios. I would encourage you to keep checking the availability calendar as you never know when other guests' plans will change.
Jamie, whether you're hoping to
shrink down to the size of a toy,
ride the rails with Mickey & Minnie or
live your Star Wars adventure, I'll be hoping that you're able to secure a different day to spend more time at Disney's Hollywood Studios.
In the meantime, I would encourage you to think about one or two attractions that you're really hoping to experience as you're planning for your half days. There have been trips in the past when my family was in a similar situation and we knew we would have limited time in one park. Thinking ahead and prioritizing our "must-dos" helped us feel like the time we did have was well spent.
Best wishes, Jamie, as you are gearing up for your Magical vacation. Please come on back and see us here at planDisney with any other questions you might have.
And... as my Jedi friends would say, "May the Force Be with You,"
Lauren