Here are some recommendations for lunch in College Park. All of them have vegan and vegetarian options.
Li chun: Chinese cafe, serving crepes, salads, and noodles. $15-20 price range.
Falafel Inc: Falafel and shawarma sandwiches and bowls. $7-12 price range. (Pick up only, no dine-in; there is a plaza by Li Chun where you can eat.)
SoulSpice: Korean-inspired salads and bowls. $12-15 price range.
Taqueria Habanero: tacos and burritos. $12-20 price range.
If your utility function cares about minimizing distance and is indifferent to food quality: plenty of places in the Stamp student union, just behind the LSC!