But you could do just ONE day of the Fastpasses at a particular park, and use the other three for tickets. If we finally get to do GAD for our December trip and get three vouchers, we'd likely take DW and mine and upgrade them to tickets or APs, and take DD#1's and use that for FPs (since her ticket will be cheaper anyways). DD#2 won't even be eligible to volunteer until the end of October, so we're not including that in planning.
Then again, we may not even NEED them in early December. But for once it would be fun to actually use something I write about