Hello there Lisette, and welcome to planDisney, we're so glad you're here!
Lisette it will depend on how many days you are visiting the
Disneyland Resort if you'd like to visit both
Star Wars: Galaxy's Edge in
Disneyland Park and
Avengers Campus in
Disney California Adventure Park. If you only have a One-day ticket, then yes, you'd need to add on the
Park Hopper option to your ticket to be able to experience both, which I highly recommend since they're both so immersive!
However, if you have a multi-day ticket, you could visit Disneyland Park the first day to experience Star Wars: Galaxy's Edge, and then visit Disney California Adventure Park the next day to experience Avengers Campus if you'd prefer to not add on the Park Hopper option. It truly is up to you, but it is very convenient to park hop between both parks since they're located so close together.
Two attractions we never miss on our trips to the "Happiest Place on Earth" are
Star Wars: Rise of the Resistance, it's a Star Wars experience like you've never had before with so many fun surprises, and my kids' favorite is
Guardians of the Galaxy - Mission: BREAKOUT! where you help Rocket try to help the crew escape to some awesome tunes! Both also have some of the best
character experiences with some great photo opportunities as well that you will not want to miss.
Lisette, I hope this information was helpful as you plan your vacation. Please do not hesitate to
come back to planDisney and ask me any other questions, I'd be more than happy to help!
Have a magical day!
Melissa