As someone who travels consistently, I am always going to currency exchanges to keep cash on hand…read morein case of emergencies. Despite what you may think, the exchanges in San Ysidro give a better exchange rate than the ones in Tijuana, the airports, or in LA.
This particular exchange has served me well, considering the fact that they are open 24/7. As I had quite a bit of pesos and euros laying around, I decided to come here the other day to exchange these for dollars.
FYI: they exchange pesos to dollars and vice-versa any time of day or night, but they only exchange euros during the day.
The staff here is always friendly, and the exchange is quick and seamless. They have a sizable parking lot, and I've never had any bad experiences in this area, even though I'm usually just passing through San Ysidro.
This is a currency exchange place I recommend you use before you head to Mexico, of once you're coming back from there.