I eat a LOT of Mexican. I've been trying to eat healthier, though, so it's been challenging to find things that are lower in calories. One go-to: Avocado salad! There's some really good salads at mine.
Opt for chicken or seafood instead of beef.
Skip the rice, cheese dip, and fourteen pounds of chips. Salsa's REALLY healthy, but those tortilla chips are NOT! Count out your serving before you eat, and stick to them. Plan to eat say, 9 chips, and stop! Don't eat the whole basket.
If you like sour cream... don't. LOL. That stuff is a calorie bomb for sure!
Here's one article I found that's got a lot of great tips: weightloss.about.com/od/eatsmart/a/aa05020