I spent three hours in Tijuana last week, on a Wednesday evening - from 7PM to 10 PM.
I took a cab to Adelita Bar, and had a beer there - some very nice looking women, but I had previously decided to spend my money on the street girls. To do this, I made a right out of the bar and took the next right, heading up the hill. It was possible to 'zig zag' through the streets this way, and I found good action on the street behind Adelitas Bar, as well as the streets perpendicular to that road.
I walked around for a bit, sizing up the possibilities, when I selected girl #1. Young looking, a bit chubby when undressed but a good time nonetheless. Cost was $35 for everything, including 'sin ropas' (No clothes). (This was my price for the entire evening). Girl got on top, then missionary to finish. Very nice.
Second girl was thinner and prettier, same price. Found her on a street parallel to the Adelitas bar, but several blocks up the hill. This one also spoke some English, as did Girl #1. She was friendly, and I could have spent an hour with her easily.
Third girl looked great in clothes but not so great naked. She was the only one to blow me (with rubber) before fucking. She was passive, as were all the girls, but I could put her in any position I wanted. I actually didn't shoot a load with #3, but it was a good ride nonetheless.
The last girl... my God, the last girl was a mind blower. She was on the street directly behind Adelitas bar (where you can find a LOT of women, by the way). 20 years old, flat belly, pretty face, trimmed kooch... you name it. She was the most reticent of all four women, but she had a thoroughbred body - simply amazing. She was uncomfortable with me playing with her tits, but I was firm and did it anyway. There is no other way to say this next part: her pussy and asshole were absolutely perfect and beautiful. The girls do NOT like you to touch them that way, and this girl was no exception, but as I was doggying her I spread her ass and looked down - I swear to you, I wanted to pull out of her and lick her ass... it was THAT perfect. Smooth, hairless, tiny - guys, I would have paid $300 for this girl for a GFE. Luckily for me, she was #4 of the evening and I was low on cash (and errectile capability!). Even though she was a street girl, I think I would have been unable to resist DATY.. but don't worry, they will NEVER agree to that! (I hope!). I finished this girl in missionary, and pushed her legs up and REALLY pounded her to climax - I'll never forget how beautiful her eyes were when I finally shot my load. Damn!
I can't speak with too much experience, having sampled only 4 chicas... but everything I've read here on the board is true: the street girls are somewhat passive, not really "into" the sex, but they will generally do what you ask within reason. I didn't go for anal or oral (but I did blown unasked-for with #3), and I always negotiated 'no clothes' up front. I paid after each encounter, and the girls accepted that (though most of them asked for money up front).
I guess this makes me a bad person, but I found that you could get them to move a bit by breathing in their ears or kissing their cheeks - they really don't like that, but it DOES make them move their ass a little bit!
What else? I found that it is easy to walk around in the neighborhood, buying cans of "coke light" when thirsty. I didn't bother with any bars besides Adelitas for beer and a little show. I also confirmed that some of the girls will literally grab your shirt/arm and hang on... which I found extremely annoying.
I found the whole experience to be VERY satisfying, and I'd dearly love to repeat it in the future. If I had it to do over again, I think I'd do almost exactly the same thing - walk around a lot, inspect the merchandise and be choosy.
If you go, have a great time!
PS - I brought alcohol wipes and "KFC" style moist towelettes... I shared with the girls, and they seemed to appreciate them.