Just before Christmas this year we took the kids to Holiday In The Park at Fiesta Texas San Antonio. Over all it was great, I actually thought it was one of the highlights of the holiday seasons for us...very pleasantly surprised with it and kids loved it. During the holiday season the park is only open Friday - Sunday during select hours later than usual. We went on a Friday from late afternoon around 5PM (parked right up front almost) until around 9PM, since it was Friday the crowd wasn't too bad at all but I'm sure it is much busier on the actual weekend days.
We got there as the sun was coming down so not all the lights were on yet but it was a very nice set up they had and once it got dark the Christmas lights showed very well. Most the rides were open that the kids could enjoy as usual. The train around the park was probably one of the busier attractions this time of year and the ride was nice as well through the park. While there we walked the entire park since it wasn't too hectic and had no issues with crowds or getting around which we rarely do with our little ones. The main Christmas tree was a good scene full of lights and had some show activity going on around it as well people gathered for.
There was also a giant ornament right in front can take a photo with the family. Also, I was surprised they had a nice santa available to take photos with that the kids enjoyed plus it was right next to the buffalo salon where the wife and I could grab a Dos XX. The park definitely got busier as the night went on as I'm sure most people come for the lights after dark but over all a really good experience and will be back on the list next year as well for Christmas time in San Antonio.
Six Flags Fiesta Texas San Antonio is located in North San Antonio just outside of Loop 1604 off of IH-10 near La Cantera Mall and the Rim Shopping Center close to UTSA.