Hi Melissa, welcome to planDisney!
You can absolutely upgrade your
three-day park hopper tickets to five-day park hopper tickets. In my opinion, the easiest way is to visit the amazing Cast Members at the
Disneyland Resort Main Entrance Ticket Booths, but seeing that you are not from California, that might be a bit difficult for you. You can also try calling the
Disneyland Resort Tickets line, or try the chat feature in the
Disneyland Mobile App where you can speak with Cast Members. They could potentially direct you to the Main Entrance Ticket Booths, but it's still worth a try! The Cast Members can walk you through the specifics of the difference in cost that you would have to pay.
Since you will be coming from out of state, I'm guessing you'll be needing lodging accommodations? If so, the
Disneyland Resort Hotels are fantastic. My family and I try to stay at
Disney's Grand Californian Hotel & Spa if we're able. We love the convenience factor as it has direct entrances into both
Disney California Adventure Park and the
Downtown Disney District! If you're looking for other options, have no fear, Disney has a listing of
Good Neighbor Hotels that you can choose from as well!
AND WAIT THERE'S MORE! The Disneyland Resort is bringing back its nighttime spectaculars this spring on April 22, 2022! The
Main Street Electrical Parade and
Disneyland Forever fireworks will be returning to
Disneyland Park, and
World of Color will be returning to Disney California Adventure Park. If possible, I would plan your upcoming vacation after April 22, 2022, so you can enjoy these amazing nighttime experiences!
See ya real soon!
Jin