Hey there, Will, and welcome to planDisney!
Thanks for coming to us with your question and I'm happy to see that you'll be bringing your daughter to the Disneyland Resort later this year! Some of my happiest memories involve spending time at the Happiest Place on Earth with my kids. I've even had visits where it was just me and one of my kids instead of both. We certainly missed our other family, but having that one on one time was just so special!
The price of adding the
Park Hopper option to your ticket is a fixed cost that will apply towards the entire length of your ticket (the price would have been the same for a 1-Day Ticket). You are able to upgrade your ticket to add this feature and it'll cover both days. Since it's well before your visit, please call the
Tickets phone line and speak to a friendly Cast Member who should be able to assist you. You're also able to make this upgrade by visiting the Main Entrance Ticket Booths when you are on property, but you'll be subject to reservation availability, so it makes more sense to take care of this before you arrive.
You're visiting right in the midst of the
Halloween Season which is my favorite time to see the Resort! The decorations evoke feelings of Fall with pumpkins everywhere you look on Main Street, U.S.A. Additionally, it was just announced that
Haunted Mansion Holiday will be
returning this year along with the
Expanded Grounds and Queue! I'm especially excited for a more immersive queue and perusing themed souvenirs in Madame Leota's Carriage House after exiting the attraction!
Will, I hope that this was helpful for you and please return to us anytime you have more questions. We'd love to continue being involved in planning your magically spooky visit to the Disneyland Resort! We'll see ya real soon!
Wishing You a Great, Big, Beautiful Tomorrow!
-Al