Bangkok City is by far my favorite place for Thai food. They offer the typical pad thai and a variety of Thai curries, as well as a wide range of other noodle and rice dishes. The typical entree comes with veggies and a choice of meats or tofu. Big boon for vegetarians: almost any dish can be made veggie, and they way the tofu here is prepared is excellent; it's not too soft and has a very slightly crisp, meaty texture to it.
Desserts include fried ice cream and the delectable fried bananas. Purple flowers on many dishes offer a nice decorative touch.
Oh, and be sure to try their Thai tea while you're there!
The dining space is large but cozy at the same time, thanks to wood-panelled walls, a large TV screen, and a variety of "ethnic" decorations to feast your eyes upon. Service is fast and friendly, and prices are about average for similar restaurants in the area, around $8 per entree (though typically served family style so you won't need a dish for each person).
The main downside, at least for fans of spicy Thai cuisine, is that their food is just not spicy enough! Even if you ask for your order to be the spiciest available, it's typically not even as intense as a bag of Flamin' Hot Cheetos. Still, very tasty and highly recommended; very convenient to the SMU campus!