For "real" food, the cedar planked salmon at Artists Point. I never knew so much could be done with salmon.
For more basic stuff, a cheeseburger from Beaches and Cream. Burgerdom raised to new heights!
Desserts? Actually, carrot cake from most anywhere ... Main Street Bakery comes to mind, but I think the same recipe is found in other parks.
Breakfast? Tonga toast, natch.
Oh, darn. You just said one thing, right? Gotta go with the salmon.