Hi Joan,
Welcome back to the Disney Parks Moms Panel! Disney's Grand Floridian Resort & Spa is one of my favorite resorts!
Since we typically stay at one of the resorts with access to the
resort monorail and we generally have a few pre-park opening dining reservations, we are always concerned about early morning transportation. On our last visit, the resort monorail started running as early as 7:00 a.m. Remember that guests can enter Magic Kingdom one hour prior to park opening to enjoy Main Street, U.S.A. and see the
Let the Magic Begin show. So, I think you will be able to use the resort monorail to get to Magic Kingdom for your reservation at Cinderella's Royal Table. When you arrive, just check with a cast member at your resort hotel to get the resort monorail hours of operation for the day of your reservation!
Joan, another option would be to use the
Minnie Van™ Service. For additional information, check out this Disney Parks Blog article,
Minnie Van Service Now Open to All Visiting Walt Disney World Resort. On our last visit, when we had a pre-park opening dining reservation at Magic Kingdom at 8:00 a.m., we arrived by 7:30 a.m. After we checked in with a cast member, we waited in a line to the far left at the entrance. They allowed us into the park at 7:45 a.m. On our way to the restaurant, we took a few pictures because the park was nearly empty!
Magic, memories and Minnie Mouse hugs,
Donyell