On the northwest side of town sits Six Flags Fiesta Texas, which has activities for young and old with as many musical attractions as games and carnival rides. Sea World of Texas is on the west side of San Antonio. The San Antonio Botanical Gardens includes 33 acres of colorful plantings and native Texas exhibits which reflect a part of Texas history. The Sunken Gardens and San Antonio zoo anchor Brackenridge park, just a few miles north of downtown. If you have time to do some more serious driving, head out to the Hill Country.
Comfort has one block in it with a few restaurants and antique shops.
Or if you have more time, drive to Fredericksburg. Go out IH-10 toward Kerrville. About halfway there you'll see the road that turns off to Fredericksburg. Just past Fredericksburg is Enchanted Rock State Park which is a great place to do some hiking. You could also spend a day driving north on Highway 281.