Greetings Marbel and welcome to planDisney! Thank you for bringing your question our way!
It may be possible to upgrade your One Park Per Day
Theme Park Ticket to include the Park Hopper Option. But, you must make this change at the
Disneyland Resort Main Entrance Ticket Booth. And, please note this upgrade is subject to availability. You may want to check the
Availability Calendar first to see if Park Hopper Tickets have availability on the day of your visit.
If you are able to upgrade to a Park Hopper ticket, you will have the option to hop to the other theme park starting at 11:00 a.m. You will not be required to make another
Theme Park Reservation in order to visit the other park. And, you may hop back and forth as often as you like (subject to attendance availability.)
If you have more questions, please head back to planDisney!
Tiffanie