My favorite resort breakfast/brunch is probably at Topolino's (Riviera Resort). It is pricey and a character meal but you can order more than one entree as well as more of items and the food quality is outstanding. Another recommendation is Ale & Compass at the Yacht Club. They have a buffet option and the way it works is you order a single entree from the menu but then have access to this all you care to enjoy buffet of "sides" that includes fruit, pastries, yogurt, granola etc. The buffet option is only ~$5 more than if you just ordered the entree by itself and is a really great value. A&C also tends to be calmer and might be a nice spot for post-race relaxation. I think the 10K is on a weekday during marathon weekend but if a Saturday or Sunday there are also great options for brunch in Disney Springs (Wine Bar George, Homecomin', Boathouse, Raglan Road etc.). Good luck with the race!!