Hello, Lisandra!
Welcome to planDisney, and thanks so much for stopping by!
I'm so glad you will have more time at the Disneyland Resort. There's so much to see, enjoy, and celebrate that you'll quickly fill three days.
You can modify your
ticket at the Disneyland Resort ticket booths as long as there's availability for ticket and park reservations. So if you live nearby, you can stop by and modify your ticket before your trip to
secure park reservations for the third day.
The safest bet if you don't live nearby is to purchase another single ticket to secure your reservations in advance. It would be a shame to have an extra day at the
Disneyland Resort and be unable to modify your ticket due to a lack of availability.
I hope this answer helps you create a fantastic trip to the Disneyland Resort, Lisandra. Let us know if you have more questions, and we'll be glad to help!
May the magic be with you,
Julie