Hi Terri!
Welcome to the Disney Parks Moms Panel! How exciting that you'll be at Walt Disney World Resort during
The Most Wonderful Time of the Year! Mine is a Military Family too, so thank you and yours for your service! You do have a few options to get to both of these dining reservations.
For Be Our Guest Restaurant, which is in Magic Kingdom Park: I would walk to Disney's Polynesian Village Resort, where you can (first option) take a complimentary Water Taxi from the backside of the Polynesian directly to a dock in front of Magic Kingdom Park. Or, option two, from the Poly take another short walk to the Ticket and Transportation Center. From the Ticket and Transportation Center, you can catch either the world-famous Disney Monorail or a Ferryboat. All of these options will begin about an hour before the park opens for the day, but you'll find more regularity between the Monorail and the Ferryboat.
For your reservation at Disney's Yacht Club Resort, you can either go back to the main entrance area of Magic Kingdom Park and catch a Disney Resort Bus over to Disney's Yacht Club. Or, if you are planning on visiting Epcot that day after breakfast (or any park with a Park Hopper Ticket), you can take the Epcot Monorail from the Ticket and Transportation Center to the front entrance of Epcot, where you'll enter the theme park and exit through a side ticket gate between the UK and France pavilions of Epcot's World Showcase. The Yacht Club is about a five minute walk from that World Showcase Gate.
The fastest, most direct mode of transportation, would be a
Minnie Van, which is a hired ride ordered through the Lyft App. I like that each vehicle is owned and maintained by Disney, and each comes with two car seats!
We'll See You Real Soon, Terri!
~Kristen