Welcome to planDisney, Vicki!
Hooray! More time at the parks is always a great thing! You can most certainly upgrade your four-day ticket to a five-day ticket. You just need to visit a Disneyland Resort ticket booth when you arrive and pay the difference. One thing to keep in mind, though, is that a
theme park reservation will be required for that 5th day, but you won't be able to make a reservation until your ticket is upgraded. So, I strongly recommend checking the
theme park reservation availability calendar to see if there is availability on that 5th day before paying to upgrade your ticket. Also, it's probably a good idea to stop by a ticket booth on your first day as theme park reservations become more scarce as time goes on.
If there isn't theme park availability for that final day, you might consider spending your extra time hanging out in the
Downtown Disney District. You can shop at all the amazing stores like World of Disney, Disney Home, and the Disney Dress Shop. Then you can have a delicious meal at one of the incredible restaurants like Naples Ristorante e Bar, Catal, or Ballast Point Brewing Co. Or you could even spend your last day bowling at
Splitsville Luxury Lanes! There is certainly no shortage of things to do in the Downtown Disney District.
I hope this information was helpful! Have a great time at the Happiest Place on Earth!
-Linda