Neat trick by Saylor to get tickets for her family. (Kidding of course) I bet the Caroline Ducharme , and AD families are also on the preferred list for UCONN tickets-they should be if they can get to SA, TX..
I'm surprised that no one has questioned the 4th Region name, the first three are pretty obvious but not the 4th, Mercado. My last trip to SA was a couple of years ago but the Mercado was a small nighttime area with a couple of really good Mexican restaurants and a small number of shops. If you can get there, I highly recommend an excellent restaurant, Las Margaritta (sp?) which was the better of the two restaurants, but both were very good. Great drinks and don't forget to get some pralines to go at your checkout. About 1-2 miles from the Alamodome.
In addition to the Alamo, itself, if you have a car, don't miss taking the Mission trail of 5, 1800s Missions. If you have more money than you will ever need then go to the bar at the top of the Hemisphere. Good view but really overpriced. Lot's of good restaurants on the Riverwalk itself. I just hope they aren't out to rip you off with so many visitors. UCONN fans might want to wait until after the losers in Rds 1 and 2 leave town to get shorter waits for most things, including dinner reservations.