Hey there Quinn,
Welcome to planDisney and thanks so much for your question. It sounds like you have the best kind of problem - you want to visit the Disneyland Resort for longer! I just had to do this for a trip with my family last year, we had a 2-day visit planned, but realized we could absolutely squeeze in a third day.
To add on this additional day, you'll want to reach out to a
Cast Member at the Tickets line. They will be able to see all the details of your trip and can help you add on that extra day of Magic. You can ask the Cast Member when you call to confirm, but there is also a chance you might have to make a
theme park reservation for this additional day if the Cast Member is not able to do this over the phone.
To do this, you can visit the
Disneyland website, hover over "My Disneyland" and select "My Plans." This will take you to a really helpful hub that shows you all your upcoming trip details in one place. From this page, you can scroll down and you should see each day of your trip along with the park that you have selected as your reservation. If you need to add or change a reservation then you can click the "Manage Reservation" on the right side of the page for the day that you want to modify.
Thanks again for your question, Quinn! I hope you have a great trip to the Happiest Place on Earth.
Have a Magical Day,
Greg