Hey there, Karina!
My warmest welcome to planDisney! We’re delighted you brought a question our way!
I am so pleased that you are looking to upgrade your One Park Per Day Theme Park
ticket to include the Park Hopper Option. Doing so will allow you to experience even more magic! Like the all-new
Avengers Campus at Disney California Adventure Park and the return of nighttime fireworks at Disneyland Park!
This upgrade will need to be made in person at the Disneyland Resort Main Entrance Ticket Booth. And, you are correct that it is subject to availability. I recommend checking the
Availability Calendar to see if the Park Hopper Option is available on the date of your visit. If you are able to upgrade, you will start at the theme park you originally chose and be able to hop to the other theme park at 1:00 p.m. You are not required to make an additional theme park reservation to visit the second park or hop back and forth between both parks. But, as always, theme park admission is subject to attendance availability as well.
Thanks again for your question. If you think of any more questions, don’t hesitate to submit them!
Tiffanie