Hey there, Natalie!
Thanks so much for stopping by planDisney with this awesome question. The only thing that I love just as much as Walt Disney World Resort is Costco. I mean, is anything better than that $1.50 slice of pizza?
Even if you have made your
Disney Park Pass system reservations, you may still cancel your
vacation package within the 30-day window. Disney Park Pass system reservations do book up, so I actually encourage you to make your reservations as soon as you book your vacation package. If you have to reschedule your trip, remember to cancel your Disney Park Pass system reservations as well, so that other Guests may grab them.
Natalie, you will have to check with Costco Travel to see if they impose any additional fees if you do have a cancellation. They may recommend that you purchase travel insurance, as well.
I hope that you have a wonderful time, Natalie.
Happy planning!
Sarah B.