Hello Brian!
Thank you for visiting the Disney Parks Moms Panel! Yes, you can upgrade your
Walt Disney World Theme Park tickets with the Park Hopper Option during your stay if it is within 14 days of a theme park ticket’s first use and the ticket has remaining admissions. The cost is between $53.25 and $79.88, depending on the ticket. I usually recommend upgrading sooner rather than later, because the cost per day goes down the more you use it.
If my family is staying at Walt Disney World a week or longer, then we usually don't use the Park Hopper Option. We take a slower approach to park touring. However, for shorter visits, we like to hit all of our favorite rides at the different theme parks and stay for
Extra Magic Hours. Then we'll hop all over, sometimes visiting three theme parks in one day.
If you have any other questions, please come back and see us real soon. Have a magical vacation!
Tania