Hiya, Tess!
Welcome to planDisney! Thank you so much for sending this 
Disneyland Resort vacation planning question to us hEAR!
This is a great question. Adding the Park Hopper option to your 
Disneyland Resort Theme Park Admission Tickets is actually a flat fee that will cover all of your Disney days. It doesn't matter if you have a 1-Day or a 5-Day ticket, that one upgrade charge will get you into both 
Disneyland Park and 
Disney California Adventure Park on all of the days you plan on playing at The Happiest Place on Earth.
Speaking of planning your park days, have you checked out the 
Disney Parks Blog lately? It's the source of Disney Parks news, practically straight from Mickey himself. They have so much info about fun things you can't miss when you're in the parks, seasonal tips, even 
Foodie Guides themed to the current seasonal offerings. You can even 
follow them across all of your social media accounts so you're sure to never miss the newest Disney Parks news!
I hope that this helped to clEAR up your question, Tess, and better plan your upcoming Disney days! Be sure to follow the 
official planDisney Panel Instagram account for even more tips and tricks. And if you have any more 
Disneyland Resort vacation planning questions, We're All Ears!
~Kristen N.