What all you need to cross the border? What areas are nice to sight see? And what areas stay away from?

I was just thinking a day if I do ever go?

If you going to be in Mexico for less than 7 days, you don't need anything. Over 7 days, you will need to get $33 mexico visa for 180 days. If you are driving, you will need Mexican insurance. If travel outside Baja and Sonora states, you will need import permit

Your passport. Revolution ave., restaurants, lots of good food. A little bit further down is rosarito beach