Senor Veggie is a vegetarian Tex-Mex place that I think you'll like.
La Fonda on Main has the spinach enchiladas and a series of margaritas, including one of my favorites in town. It also has a gorgeous outdoor patio, if the evenings are warm while you're there (and they really could be).
La Gloria is a chance to visit the Pearl Brewery campus for excellent Mexican food by the water. You can also tour the grounds, see the Hotel Emma, which is a foodie hotel that has a remarkable interior. (
http://www.thehotelemma.com/)
Lick, an ice cream parlor with some great choices, is also at the Pearl, as is Green Vegetarian and Bakery Lorraine, which makes the finest macarons in the state. Two places on the property brew their own beers. It's fun for a walkabout, too, if you want to try a course at one place and then move on to another place and another and another.