Hi Shawn, our family loves
1900 Park Fare - it's one of our favorite breakfast choices! The easiest way to get there from
Fort Wilderness is simply heading to the Marina and taking the boat that goes to
Disney's Contemporary Resort. From there taking the Monorail to the
Grand Floridian, which will be the third stop. You can also take the boat to the Magic Kingdom and take the Monorail from there, but that will probably be longer because you have to go further on the boat, and make more stops on the Monorail. 1900 Park Fare is downstairs from the Monorail station, just follow the signs once inside the resort.
As far as having an advanced dining reservation at one of the restaurants inside the parks, you must have Disney park admission tickets in order to get to your reservation. You will not be allowed into any parks without tickets.
I hope that helps with your planning and that you have a wonderful time on your vacation!
~Suzannah