As to be expected, Acapulco doesn't supply nutritional information (and a googling didn't turn up anything relevant either, on a cursory notice.) So I'd say eat lighter for the other meals/snacks of the day, and make more healthful options @ the restaurant.
Tortilla Soup is usually healthy, ask for no cheese (and depending on how you feel, no or "on the side" for tortilla strips and avocado)
Send the bowl of chips back! Or if your dining companion wants it, keep it on his/her side of the table and as far away from you.
Grilled meats (such as fajitas) are generally healthy, but ask for black instead of refried beans, and no to sour cream (and possibly the guac.)
Fish/shrimp tacos can also be healthy, w/o the cream sauce and cheese. Ask for pico de gallo/salsa instead.
Of course, stay away from the cheese ladened stuff like quesadilla & enchiladas.
Steer clear of the margaritas, lots of sugar and empty calories! If you must have alcohol, go for a beer instead, or a tequila shot with lime juice chaser.
Finally, ask for a to-go box when you get your entree (esp. if you had an appetizer) and put half of everything in there right away.
Current program: 1,800 calories most days of the week; 45-60 minutes of mixed exercises (weights, cardio-kickbox, dance, athletic intervals) 6 days a week
Current goal: 135 pounds by birthday (July 14th) and to run half marathon at end of May.