Want good BBQ go to The Big Bib. Stay away from
anything that's a chain when it comes to BBQ and
Mexican food. The best Mexican (Touristy Mexican spot here)
is Mi Tierra. As stated above you can't go wrong with
anything on the menu. I think one of the best tours here
are the bus tours. The tour takes you all over the city
and shows you pretty much all there is to see downtown.
You can get off and explore and catch the next bus.
Not sure how you're getting here or leaving, but if you
need to be back at the airport or anywhere north of SA
I would suggest leaving downtown around 4:00 to be comfortable. Every
highway here becomes a shit show after 4.