Hi Elizabeth!
I've been on a few last minute vacations, and they are tons of fun! Sometimes it is really great to go with a very loose plan and go with the flow!
Even without
FastPass+ you'll still have the chance to meet Anna and Elsa. The Standby Queue will be available to you, and while it might be a bit of a wait, you'll still be able meet them.
For our kids, Fantasyland is pretty much a MUST do, and quite honestly they could possibly spend all day there! I'm sure you'll find yourself spending quite a bit of time there. My kids still love to ride Prince Charming Regal Carrousel multiple times during a visit, and they're 4, 7, and 9!
Also, make sure you check out
Enchanted Tales with Belle. It's great fun, and so adorable with all the little friends invited to participate in the story!
Have a magical vacation!
Amanda