It depends on what kind of food you’re looking for, but here are some ideas. In our experience, vegans and non- alike have enjoyed these veg establishments: Portobello, Blossoming Lotus, and Natural Selection for dining; Dovetail, Sweetpea, and Back to Eden for baked goods; A.N.D Cafe for brunch, Canteen for juices/bowls, Bye and Bye/Sweet Hereafter for bars with food. You could also go to Mississippi Marketplace as Homegrown Smoker and Native Bowl are in a cart pod where you could each order your own things. Other veg carts you guys might like are Wolf & Bears (falafel) and Bombay Chaat House (Indian).
For mixed places, there are lots of establishments with vegan options, but some with a larger selection include Vita Cafe, Los Gorditos, Hungry Tiger Too, Departure, Sizzle Pie, Brass Tacks, Luc Lac, and Voodoo Doughnuts. Hope that helps and have a great trip!