This what I do when I go to the zona. Walk across the turn styles. You officially crossed the border. Go straight until you see a bunch of taxi drivers. Tell the driver that you want to go to adeletas bar. If he tries to tell you of another bar. Don't do it because he gets kick backs and that bar is pure bullshit. Just tell them to still take you to adeletas bar. Its about five bucks. About a ten minute drive into the zona. They'll drop you off right in front of the bar. You can do this in the day time if your a little jittery going during night fall. Thats what my buddy does. Kick back for a few hours and take the cab right back to the border.
