El Tinajon is probably the oldest Guatemalan restaurant in town, or close to, and so it's not exactly pushing the envelope with its Mexican and Guatemalan menu, but it's a perfectly solid, nice place.
Thai Linda I order from a lot when I'm in the mood for standard Thai stuff-- everything's fresh and tasty, tastes exactly like the better 50% of all the other Thai restaurants in town. No secret menu, in fact, the "specialties" on the menu usually don't come off as well as the most basic stuff-- pad thai, mussaman curry, pad woon sen etc.