Hi Laura,
So glad to know you are planning a vacation to Walt Disney World Resort by yourself. I had the opportunity to do something similar some years ago, and it is indeed such a different but wonderful experience.
I love the Park Hopper Option for
Theme Park Tickets. It gives me the flexibility to move from Theme Park to Theme Park without worries. Now to answer your question, like Master Yoda said, "Difficult to see. Always in motion is the future..." It seem that at this time, the schedule for Disney's Animal Kingdom Theme Park is not available for October. I have a feeling that that park would close later than usual, especially with the imminent opening of
Pandora - The World of Avatar. Therefore,
Fantasmic! and
Rivers of Light may end up at the same time.
One last tip: there is a new faster way for you to move between Theme Parks. The
Express Transportation Option is a nonstop service between the parks that will take you straight inside the other Theme Park, bypassing the main entrance, and giving you more time to play. Happy planning!
Ricardo.