Juarez!!! Great place to go. I love Drink and Drown! Of course,if you're a female, it's not the best place to go anymore....
Derrock is right. ALWAYS say UNITED STATES when crossing back over the border. And get the hell out of there before nighttime. Other than that, there are many watering holes that always offer 3 for 1 beers. Stay away from the bathtub tequila and street vendor food.