Hi Wonderful Nicole! :) I'm sorry to hear you weren't able to secure an advanced dining reservation for Cinderella's Royal Table. It's always good to keep checking back as there are cancellations and, though rare, some people have actually lucked out with a walk-in spot. If that doesn't happen for you however, you can still walk through the Cinderella Castle arches and take a look at the amazing mosaic work depicting scenes from Cinderella. The display took 22 months to complete and contains just over 300,000 pieces of
Italian glass and rough smalti (glass made specifically for mosaics
traditionally used by Italian craftsmen) in more than 500 colors. It is truly a magnificent sight to see.
There used to be a gift shop inside the Castle as well but a few years back it was turned into a
Bibbidi Bobbidi Boutique location for princess-style makeovers. You can book reservations for this service at 407-WDW-STYLE if it's something you'd like to do.
Outside of that, you can get some great photos through the arches in either direction; looking toward Main Street or Fantasyland and just soak in the wonder of walking through a castle in the middle of Florida! ;) You'll find there are memories to be made everywhere!
Have a wonderful vacation!