Greetings Helen!
Welcome to the Disney Parks Moms Panel. I'd love to assist you in planning your Disneyland Resort vacation. I'm also glad you are already considering your game plan if you think you may not have experienced enough magic in your two days at the Disneyland Resort. Good thinking! You most definitely can upgrade your
park ticket to one of longer duration during your stay. Just keep in mind that all upgrades must take place before the end of your last day of admission, while the ticket is still valid. You can do this at the ticket windows located in the esplanade between
Disneyland Park and
Disney California Adventure Park. Also keep in mind that you can only upgrade to the same or higher level ticket type. For example, if you have a 2-Day Park Hopper Ticket, you can only upgrade your third day to another Park Hopper day, not a 1 Park Per Day Ticket. Alternatively, if you have a 2-Day 1 Park Per Day Ticket, you can upgrade your third day to the same type of ticket or a Park Hopper Ticket.
With all the amazing attractions, delicious dining, and wonderful entertainment at the Disneyland Resort, I have a feeling you will want to spend a third day soaking it all in. Even when we have a 4-day trip, it never is enough!
Please return if you have any other questions as you plan your vacation!
-Jennifer