TJ's fun as hell, drinking is super cheap, just go with somebody who knows it so you can eat somewhere good. I spent a few days in a TJ jail years ago, that wasn't fun really. But everything else about TJ is great. Don't stay past dark and don't wander around. The key is to go with somebody familar with it. A bunch of n00bs all going together is not a great idea. As for taking money to bribe the police. The only time I had to pay them money was when I was trying to bring back some illegal ass fireworks. Since I was breaking a law, I kind of deserved to be in a position where I had to pay them off to keep from getting locked up.
Sure it's not 100% safe there right now, but if you go the border and watch there's always a huge line of Americans going into TJ, last time I went I had to wait almost an hour to get across the border. Will be going next weekend, it'll be pretty crowded, but less so than normal because of the people who are scared and playing it safe. Which is fine by me, that just means more 3 for 1 Margaritas for me.