Hello, Amanda!
Welcome to planDisney, and thank you for sharing your question with us. It's always a pleasure to help!
Usually, Guests have to make upgrades from
One Park Per Day tickets to Park Hoppers in person at the Disneyland Resort. Because of this dynamic, I suggest getting the Park Hoppers when you
book your package.
It's also cool to remember that the upcharge for a Park Hopper ticket is a fixed fee that doesn't change if you apply it towards multiple days or a single day. So my advice is to take the plunge and get Park Hoppers anyway!
I hope this answer helps you decide on the best tickets for your next
Disneyland Resort adventure, Amanda. Let us know if you have more questions, and we'll always be delighted to share advice!
May the magic be with you,
Julie