I like the vegetarian chili in a breadbowl at Pacific Wharf Cafe at DCA, and the vegetarian gumbo in a breadbowl at Royal St Veranda in DL.
For sweet snacks, I like the "fritters" with dipping sauce at RSV as well.
I also adore a warm latte and a chocolate chip cookie, especially from the outdoor cart to the left of the castle (but I really should get it from the main st bakery b/c I can use my AP discount there).
I tried a pineapple spear, but it was very slippery and therefore not 100% enjoyable, as I worried about losing it.